For other mage jobs, people can make the case that MP pool isn't so important because all races recover MP at the same rate.
Until you factor in things like sanction/sigil/blood of vampyr, in which case you do NOT recover mp at the same rate. Also, ugly pendant activates sooner for tarus, and since they have much more mp, it's much more viable to keep it active 100% of the time.
But it's different for an RDM using convert. With a Taru, you can balance out your HP and MP and thus have the most efficient converts, giving you a significant extra amount of MP every 10 minutes.
By this logic race matters less for rdm. With my current gear (which admittedly sucks), my taru only has around the same mp for vert as my elvaan had (with very good gear). Of course once i get better gear, i'll have more with my taru, but still, not too much more, and my elvaan could have had an extra 100~ mp if i bothered to uncurse my zfeet/legs, and got some other gear. Humes can usually get better vert sets, because of their higher hp.
Of course only have 100~300 more mp in vert gear than in your lowest gear set is a pretty decent advantage instead of being stuck with 500+ more, and having to cast a spell in full mp gear, and hope it doesn't resist and get you killed. So even still, max mp matters.
The other stats aren't really that important. Tarus have insanely high INT but somewhat lower MND--this balances out and doesn't make much difference in my opinion.
They don't even come close to balancing out. Taru has 13 more int than elvaan, but only 8 less mnd. Plus, int is 10x more useful than mnd, so yeah. Not even close.