I don't even see a poll!
As with original Game Boy, I haven't played very many GBC games since I've never been interested in them, and even less which are actually on the VC.
Blaster Master: Enemy Below
I haven't played this, but it appears to be a version of the NES game. Probably not much reason to play it unless a fan wants to see the original game but slightly different.
Recommended for Kairon
Game and Watch Gallery 2 & 3
These have more games in them than the original, with 3 having more than 2. However, not all have modern versions this time, which are improved versions of the games with updated graphics and more forgiving mechanics. These simple games are all about chasing high scores, and gallery images of other Game and Watch games can be unlocked from reaching certain score thresholds in all the games. A few of the playable games also need to be unlocked this way, if I remember rightly. They can be a fun timewaster but they won't hold interest for long. I would give a slight edge to 3 since it has more games, and I think I also liked the ones it had better than 2.
Recommended for Kairon
The Legend of Zelda: Link's Awakening DX
There's not really anything I need to say about this game, I don't think. While it isn't one of my fave Zeldas, it's still good in its own right and definitely worth playing. I do still find it feels bottlenecked by being on Game Boy though, and not just because of the lack of buttons. I know this has that remake available now on Switch, but since it's largely the same game, I'm actually okay still recommending the original since the list price is ten times less.
Recommended
The Legend of Zelda: Oracle of Seasons and Ages
It's been a long time since I played these so I'm having trouble remembering them, but I do remember liking both games and think they're worth playing. They do share many similarities with Link's Awakening however so they won't seem very unique, but they're still solid classic Zeldas. I remember liking Seasons more because I found the changing seasons gimmick to be more interesting for a couple of reasons, including that it's been done less than time travel, and I also liked the more action-y dungeons since that felt more unique as well. It's worth it to play both games though and not just because they are connected, and Ages has solid dungeons as well.
Both Recommended
Mario Tennis
This game had solid tennis mechanics for its time, though honestly I never liked this version very much. You can't use the Mario characters during the story mode, and instead use some generic characters to face off against other generic characters until you win enough to challenge the Mario ones. The RPG trappings were a novel idea but the end result was just some inane chatter between matches and lengthening things with grinding up a bizarre and confusing stat system. While the Mario Tennis offerings on 3DS are not very good, I'd still recommend Open or Sports Superstars over this.
Not Recommended
Pokémon Gold & Silver
Gold was my first Pokémon and as such it was still the most fun I had playing one and I try to not be biased about it. That said, I do think this pair of games improved a lot about the originals, and as a result they are definitely more playable even today. However, since this series hasn't changed much, I still think most people would be fine just playing the latest games. But, anyone curious about the roots of this series, I'd actually recommend starting with these over the first generation games due to being less rough. I have not played Crystal however so I don't know what it changed or added, but that would likely be the version to get.
Recommended for Kairon
Pokémon Puzzle Challenge
This is a version of Panel de Pon, originally known as Tetris Attack in the US. I've always liked this more than the N64 version, if I remember rightly I liked the gym setup better for the VS computer matches, and it also has Garbage mode. There are a few unlockables such as difficulties, and a few other modes like puzzle and time trial which are nice to have as well, and has plenty of stat tracking for high scores. It even has the original Game Boy Panel de Pon hidden away. While there may be some newer versions of this game out there, this one is still a solid puzzler and for the price it's still worth grabbing.
Recommended
Pokémon Yellow
This game is actually an original Game Boy game, not a GBC game, but given the GBC coloring that the system gave to original GB games. I'm not sure why they allowed this game to run on GBC and not the others on VC, though in this case it may have been to further differentiate it from Blue and Red. Something to keep in mind. Otherwise, I'll say what I said about Red and Blue:
As someone who is not a fan of this series but still likes to play one now and then, I see no reason to return to these games else than nostalgia, especially when the series has never deviated from this same formula so there isn't anything I find unique about them. As the first in the series they are also pretty rough and lack some important information. I believe that Yellow is an enhanced version of Red and Blue, so if a fan absolutely wants to see the roots of this series, that's the one I would say to get.
Recommended for Kairon
Super Mario Bros. Deluxe
The definitive version of SMB1! Sort of. The smaller screen space is unfortunate, though it usually doesn't affect much of anything until some of the SMB2j levels. And yeah, SMB2j is in here as well, though just the original 8 worlds of it, not the extra worlds. There are some extras which I think are fun, such as beating the 8 Bowsers with fire flower and finding hidden coins in each level, which give nice reason to re-explore an old classic. The Vs Boo race is also neat, but has just 8 levels.
Recommended
Wario Land II
This is probably my fave GBC game (Yes, I'm aware it's a DX version of a GB game). As someone who enjoys exploring for secrets, this game has a laser focus on just that, with hidden coins and secret exits abound. Some of the abilities Wario can utilize are pretty funny. Simply completing a level is easy though, mainly because Wario is invincible, so anyone specifically looking for a challenge will want to steer clear. Each level is packed with coins, some even more than levels in NSMB2! There are a lot of levels and multiple paths through the game with a couple different endings, so it's pretty replayable too.
Recommended
Wario Land 3
This game is like a direct sequel to 2, with the same mechanics and some of the same graphics, but with a different focus. The levels in this game are more connected, and sometimes backtracking is needed to progress. Despite the more open design, I felt it had less of a focus on finding secrets, so I don't like it as much as 2 but it's still good for what it is.
Recommended