Yeah all RB/GH instruments are cross compatible between the two games on both PS3/360.
The DLC strategy is supposed to be much improved for GH:WT over their earlier games. They've already adjusted prices downward to match Rock Band, gave the ability to buy individual songs & packs (like RB), and are supposed to commit to a consistent schedule.
I don't think the graphics really matter so wouldn't influence me at least.
I've never used the online Rock Band world tour mode on the 360 version even with most of my friends having the game. For me at least it wouldn't make much bearing on what platform I chose tbh. Online never did much for me on these music games, they seem to be more fun with actual people with you not gamertags online. Other games like shooters and stuff are a different story though.
The friend aspect is probably the wild card though.
 |
 |
Completed X360:  |
|
| High Def Movie Collection |
