If you are looking for a very different experience, you should go with a hunter. Their jumps are very different, and they do a lot of ability chaining, combining their melee abilities with their grenades or dodge skills and even weapons sometimes. The dodge can also be built in a lot of different ways.
Warlocks are also somewhat different, but not as much as hunters. The jump is probably the hardest to learn in the game, and warlocks barely have any passive abilities that are not tied to your grenades/melee/rift/super. Most of the attunements are about playing in a specific way to get your abilities back faster.
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Ability chaining looks interesting, back in Mass Effect (when it was cool), these combinations were pretty neat. I know it's totally different game and mechanics, but I mean principle. It is indeed looks interesting, but I'm not sure I'll be able to chain them properly, as I see other people and they act like keyboard Mozarts with their symphony of destruction. All I can remember in those moments is George Carlin's "Well, I don't bend this way".:) But I admit, hunters draw my attention. Ugh, jumps... Despite 300+ hours I played jumping part is most difficult. At beginning regular stutter was the issue I couldn't even complete that "Up and up" mission on Mercury - constantly missed. After I got performance back, it stopped being a problem, but I still have issues with precision, especially involving sideways movements. Mostly in Ascendant challenges (or chests), true, but nevertheless. While warlocks may be more similar to a titan, as I do worry I wouldn't be able to chain hunter skills properly, some of your words are concerning. As leveling up basic skill tree will take significant amount of time, and getting seeds of light will take even more, I'd like to make right choice first time:). As procrastinating in game is worst offence. :D Thank you for your thorough input.