Original SSB >>>>>>>>> SSBM, period.
SSBM had clones, worthless trophies and focused the entire game on speed instead of strategy. The original SSB moved at a speed which was just right so you could plan strategies and execute them accordingly. In SSBM, the focus is more on speed and reflex than it was in SSB, making it feel more like a cheaply made arcade port than a true SSB game.
It's still a fun game, but it is NOT SSB. SSB was a phenomenon which I have yet to see replicated in the gaming world, one which my friends and I had racked up well over 1,000 hours of gameplay with.
The original SSB was like a big razz on Capcom's fighting games, even having an intro which DIRECTLY made fun of those of Street Fighter. SSB was designed to NOT be like Capcom's fighters: no ridiculous combos, no clones, no superultramegahyperalphaomegathree bullsh*t, and the focus was equally on reflex and strategy.
SSBM took a big step closer to being more like Capcom's fighters: clones, and speed and reflex are now a much bigger part of the game. As one of my friends put it, "It feels more mortal kombat-like where you should spend less time planning and more time mashing buttons." Also, SSBM gives button mashers a much better chance than SSB ever did. If you mashed buttons in SSB, you lost, period. In SSBM, a Marth player mashing the C-stick can still win 4 player time battles simply by walking into the middle of a another fight and using that near-instant smash attack to seagull kills from other players (seagulls = scavengers, if you don't live near an ocean).
I'm not trying to start a huge flamewar here, but for me, SSB will always be the better of the two games and, as such, it will be my FIRST download when the Rev N64 game download server goes live.
As for SSBDS, I think waiting for the Rev is a better idea. Also, it's not likely to happen as we've never heard a peep about development of a DS SSB whereas we're at least aware of the Rev version.
I'm hoping the Rev version will include a "classic" mode which moves at the speed of the original game. I think that, what with being online, the game would benefit from moving at the speed of the original because it would make latency less of an issue. Even with broadband, the lag time is definitely going to play a factor in how fights turn out.
-SB