The debate is likely due to damage output. The two classes are the damage dealers of the classes, with titans having the ability to dish out, but their shining aspect is their bubble. I have a hunter and a warlock, so i can say that theres a single vs multiple conflict, hunters are great for several points (resurrect in nightfalls, for just one example) but most of their attacks shine on a one-on-one basis (blade dance attacks one at a time for the most part, golden gun is single targets) whereas, Warlocks mostly deal AoE with nova bomb or radiance spam. Sometimes a warlock kill steals which as a hunter, thats a vested effort being thrown into the wind by a single ball of power, this can also cause division.