I say why not both? Titan would probably more your style because they can have a lot of armor and agility like the hunter but the jet pack will take some getting used to. Also titans have the best grenades in my opinion. Warlock is my least favorite but it has many advantages like fireborn (aka self revive) and flame shield and you can get two grenades without using a exotic slot but the lack of agility and/or armor is annoying sometimes you can get high agility and recovery or high armor and recovery never both armor and agility. I would still suggest having all three even if its just to get the grimore.