depends on what u like, they both have goods and bads, i like NFSunderground 2 because of the drifting, which Most Wanted lacks and i was disapointed with, both games should take long to get though the main game, took me about 20 hours or so on both, my suggestion would be to rent them or if u know someone how has them try borrowing them,, they both are great games. also if u like customizing the car alot u would look in to NFSU2 because u can do so much more with the customization than you can on Most wanted.