All factions have their own characteristics. TRs are generally versatile, with weapons that are easy to handle and have a high rate of fire. Of course, there are some powerful weapons that are represented, that's for sure. But if you ask me if they are the best faction, I can only answer that it depends on the individual.
Play all three if not all four. Free game, why limit yourself It also gives you insight on all that faction balance stuffs you see in yell