Totally agree with Neal's recommendations for these games.
Mole Mania is a game I played a year or two ago, and it really was charming with some great puzzles. Seeing it get a small revival on 3DS Virtual Console it great - hopefully people will give it a shot!
Wario Land is a tougher call. I have very fond memories of playing this game, and uncovering the myriad of secrets each level as I worked to build the highest possible coin total I could, but the slow pace and relatively uninspired level design doesn't hold up well years later. Worth it for nostalgia alone in my case... but hard to recommend to anyone who hasn't played the game in their past.
Somehow I bet that Wario Land will sell better than Mole Mania anyway. Name recognition and nostalgia go a long way with Virtual Console sales.