Research exclusives, and titles released and to be released then make a decision. You may also want to factor in cost and controller design. It should be your decision, and not an effort on our parts.
Just flip a coin, you'll end up getting both in the end. I thought I'd stay ps3 exclusive, but now I got all three consoles in my house, but the Wii has now been designated for parties only until further notice, since I only have wii sports for it...baaah.
I bought the Wii when it first came out, and that was the only console I had. I had reasons such as that I did not like shooting games too much (That has changed) and I thought that I liked the games coming out for the wii.
Long story short, I now have all 3 Systems, and I have never beaten a game on the wii and I have only played it 30 times?