As for me, Hunter is on 1st place. Then HQT on 2nd place and Warrior in 3rd place.
Mixups and pressure of HQT are pretty good, but still: possibility to set up mines in the air, blow 'em up any time + disk setup can make more trouble than his cannon and disk. And you can escape from HQT pressure with help of armor or backdashing and jumping out+close mine set.
But anw, that's my opinion. I think that everything depends on either variation or player's skills. No offence to HQT variation, i like it too.
About Warrior:
I think, Warrior is the weakest one. His self-detonate reminds me Jason's Pursuit in Relentless variation: at the beginning everyone was scared of it, but time has passed and everyone can easily escape from it. Also, similarity between these special moves is the possibility of opponent to turn 'em off with successful strike. Therefore, i don't think that self-detonate is more useful than mines or cannon.. And other 2 particular for this variation special move are useless.. Even if consider that one of them is overhead and can be done in the air. It is too slow. And both of 'em do less damage than bf4..
Anw, no offence to this variation too, that's just my opinion.