I have a 70 hunter already, and a 70 rogue i could use, but don't really want to bring the rogue, i'd rather use the hunter, it's better geared incase of pvp

i have a priest i'm trying to level and she's already level 41 due to questing. now im new to dual boxing. so curious if i should grind straight up in dungeons with the hunter or if i should quest it out with the hunter

i've read both things, but nothing strictly class related. or multi account related.

any ideas?