I didn't test in the field (though I crafted some), but the general sentiment I see around, it may not be really worth it. The overall damage output might be lower, and only select bosses benefit from being finished faster (the surviving twin in MoL, the troll in SCP for instance, but that's if you allowed the other one to die too early). That phase is probably short enough already, so it's hard to decide on whether bloodthirsty is useful or not.

It feels that for magicka, Arcane remains the go-to trait (since they have a lot of percentage bonuses to max magicka), and for stamina, it's Infused (since stamina is usually stacking weapon damage).