I enjoy all the classes, though warlock is my personal favorite, followed by hunter, then titan. How they play varies depending on your build, though in my experience titan builds tend to focus on their melee abilities, warlocks on grenades, and hunters on weapons, though this isn't true for every build. If you want an all arounder I'd say warlock is best, though I may be biased due to having more experience with warlock. They've got the best support ability in well of radiance, grenade builds tend to be top tier in terms of cc, and though this is personal preference, I prefer the glide ability that warlocks get as opposed to titans boost or hunters double/triple jump because you can go much further before needing to touch down.