There is also the different subclasses to consider. A Striker Titan tends to be more of a close-range fighter, emphasising in melee combat. A Defender Titan seems to be a, well, defensive take on the class, similar to the Paladins of WoW. A Gunslinger Hunter if the classic definition of ranged DPS with a slight mix of crowd control via different grenade types. A Bladedancer Hunter specializes in different knife attacks and close-range combat. Those were all a small generalization from what I gathered off the Destiny Wiki. You may want to go dig a little deeper before making a choice