Berzebub or sting glove

[Typhoom]

maybe they should get one ? but more hp > 10% cast reduct and less hp an sp

[Professor Flash]

Maybe they're a caster class & that extra 10% might help them from getting interrupted??

Shoot, I'd aim for the 95% reduc but the loss of a missy would annoy the heck out of me.
Not to mention strip shield would be useless without any dex, bleh

[Xia Xue]

i would go for sting gloves

[Aozora]

Which you get depends on what you play, if you mainly play caster classes (HW/HP/Prof/etc) or a ranged class (Archer/slinger/etc) stings are more useful.
If you play a lot of other jobs as well then berzes are more useful since they provide more reduction for all classes.

Personally I'd get berzes. They're useful for practically every classes while Sting gloves are much more limited in terms of usability. Cause that +10 DEX won't really help you if you play a Pally or a SinX, but 60% cast reduction is a lot more useful.