This isn't a "which is best" or "blah blah blah master race" thing. This is a which subclass do you have the most fun with in pvp and pve
Warlock- Void walker, grenades are super fun to use and super is so satisfying
Hunter- Gunslinger, just simply the most badass subclass of the hunter
Titan- Striker, going blind into battle and shoulder charging mofos and then failing half the time is great
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Striker. Easily. All hunter subclass feel like a chore, and in PvE everyone expects a hunter to be a Sunsinger...