This isn't the best forum for asking that...
It really depends on which system you know has the games you want. If you played some Wii games and enjoyed them, and you think you would continue to enjoy them, then buy a Wii.
On the other hand, you said you have been saving up for a PS3 for a while. I'm assuming you have lots of games on it that you want to play. It's not a matter of trying a game and liking it for a bit, it's a matter of buying the games you have waited for for months on end.
If you've been waiting to try the PS3 games you're planning for for a long time, go with it. If you're shaky of the games, or you only recently had any interest in them, go with the Wii.
Sometimes, you have to trust your gut as a gamer, and not just try to be convinced by others. That's why I bought the Xbox, but I didn't enjoy the console that much...
I own a Wii, and I can't say I'm not a tad disappointed. But that shouldn't stop you. You have to know what games and the type of games you think you enjoy most. I'm not a fan of shooter games, so I didn't find many games on the Xbox I liked. If, like me, you like all different types of games (excluding a few), then just go with the console you like the most.
