I'm going Hunter first Warlock last.
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Based off of my time in the beta I felt as though the Titan was too... immobile? I'm struggling to find the right word for it, but nothing compared to the fluidity of the Hunter's double jump - it just worked. I didn't particularly care for the Warlock's "Glide", either, but its super allowed for a more ranged playstyle that I tend to prefer. Hunter > Warlock > Titan, and I'll probably upgrade my second subclass on Hunter before I dabble back at the start with the Warlock.