Being a drummer for 10 years, I thought I would weigh my two cents on this topic. I have played both versions in the past week (I bought rock band 2 SE, friend bought guitar hero WT, both for 360) I find both to have there +/-'s.
Rock band drums are solid, and have been improved from last version, if only slightly in problematic areas (reinforced pedal, better feeling pads, wireless). They work well and are very solid. If only they could get the feel down which leads me to...
Guitar Hero's drums, I was blown away. They feel great, the cymbal matching works really well, and it does remind me of playing a drum set more that rock band. But they had significant drawbacks. I was having tons of problems getting my hits to register, and after an hour of play we had discovered that one of the cymbals sensors were broken. It seems that in intense songs where multiple pads are hit simultaneously the problem was even worse. The support structure is also flimsier than the RB2 set, but that is really due to the free pedal design, but it was not that bad. My friends like the free pedal design with the velcro on the bottom, which i agree is a better design, but the pedal felt less like a real drum pedal than RB's.
After playing the guitar hero drums, its hard to want to go back to the rock band set. But after playing the GH drums for two nights with the issues I was having I was glad to beat the game and not have to deal with the sensor issues anymore.
Hopefully the cymbal attachments for RB can re-spark my intrest in them, but I appreciate the RB set more because of the accuracy. In a game where streaks are what make or break your score, RB's set was definatly better. If only GH could fix the problems with the sensors they would beat RB out of the box hands down.
Has anyone else been experencing these problems with GHWT? You probably wouldnt unless you were playing on hard, or at least a hard song on medium. Let me know if you have.