Usually, wired guitars are better, but the Rock Band Stratocaster feels "cheap" compared to the Guitar Hero guitars. If you want a good guitar, get the Xplorer one. It's the best and will still be the best guitar controller ever.
For the drum, let me just say I had the Rock Band drum for about 5 months before the pedal finally broke. I looked how they made the thing, and it was just a spring holding the whole thing! I don't know if the World Tour drums have any metal under the pedal, but I sure hope it's more resistant than the Rock Band ones (because I'm getting them this Christmas). I didn't try the Rock Band 2 drum though, but I doubt it's that different. Besides, if I had to choose between two cymbals +3 pads vs. 4 pads, I'd take the more realistic one.
You obviously need a micro... Hmmm... Overall, I'd say go with World Tour's instruments. The slider in the guitar alone is used for some gameplay mechanics in World Tour. The Rock Band guitars have close buttons near the strum bar, but you just use them on "big rock endings" anyway (that's at the end of many songs).
Random game thought :
Why is Bionic Commando Rearmed 2 getting so much hate? We finally get a real game and they're not even satisfied... I'm starting to hate the gaming community so f****** much...
