I have neither Wii nor PS3, but I plan to buy a Wii first, among the two consoles.
I thought about it and it turns out that I have more games to play in Wii than in PS3.
I almost never play shooting, so the only games that I even want to try in a PS3 are God Of War 3 and Prince Of Persia (4).
Other games available like DMC4, Assassis Creed Series, and all, I finished and prefer to play in PC!
But in Wii, there are many games (more than 10 anyway), although as Robby said, they are for younger people.
Another thing, is that Wii is backward compatible with the GameCube.
Yes the same can be said for a PS3 (backwards compatible with PS2), but for me that doesn't matter, cause I already have a PS2.
And as for getting bored after 7 months, probably true. I got bored of PS2 (counted more than 15 games to play, then) within 2 or 3 months.
But now, after I lent to a friend I found three more games to play and am getting it back.
Then again, I don't think there are ANY consoles one wouldn't get bored with after 1/2 an year.
There is the PSP for me though. I had it since April last year and I'm not that bored with it.
Always something interesting about it. TN HEN, Wololo's HBL and so on.
BTW how much did you plan to sell the PS3 for anyway?