[quote name='botticus']These questions always seem sort of obvious to me. They have extremely different games, so whichever one currently has more games you are interested in available.[/QUOTE]
I'm not so sure these are obvious, because I assume that most people who ask there either don't play very often or (more likely imo) they are planning to eventually have both.
I think the beauty of this decision is, you can't lose. One thing I would caution you is that Nintendo releases games extremely slow for new systems (and game delays are normal). So, if you don't like the current lineup, I wouldn't be looking at 6 months down the road, because there won't be tons new (yes, I know this happens with every system, but it seems to be worse with Nintendo, again imo).
The 360 has great games right now, and some games coming down into cheap range. It's the system I decided to get right now, but I definitely think in the next year or 2, I see a Wii being hooked up to my tv.