All three are great machines. The pred and raptor are really more trail oriented, the trx is a half-breed that is meant for mx but does better in the trails.

The trx seems to have the stock handling advantage. The pred is good and the raptor needs more body english and really benefits from some supension and tire changes.

The raptor has them all beat on one thing, potential. If you are planning to upgrade things in the future its going to give you the most. It gains the most power from a pipe and filter and continues the trend as you go deeper. The pred and trx are both pretty aggressively tuned from the factory with higher compression and more aggressive cam profiles. Both can be bored stroked and boosted but you will get farther with the rap.

There is no correct answer, each machine has its advantages and drawbacks. You need to find out which machine is best for you. Do a search and you can find all kinds of comparisons between these machines.