well, honestly, I'm thinking about axing my warlock for a 2nd Titan with a PvP-centric build. My main Titan is for PvE mostly, and when there's subclasses to choose from, it's tricky to juggle the gear and the idea behind the build (PvE Titan rolls Sentinel Aggressor, but my PvP Titan will likely be a Sunbreaker or a Striker. Each will have specific gear for looks/stats AND specific mods in said gear to stack the right stats without switching out a bunch of pieces). There's also the "feel" of playing a PvE focused toon vs. a PvP toon. You develop the right habits for each instead of having to rewrite how you play when you're just messing around or knocking out milestones on a single toon.