Worgen mobility is easily countered by all Melee slows, roots and ranged CCs. It was useful in MoP/WoD when mobility was not so OP and range CC was not so vastly distributed across all classes.
Human in the other hand could be more usefull for PvP.
But i would rather recomend a void Elf for any caster class, because void elf teleport is harder to predict, unlike the worgen sprint. As void elf your spell casts are not delayed by taking damage, and this is a huge plus.