I'm gonna have to put up the age-old "sh*t is situational" here. All races except perhaps Galka has a shining aspect as RDM, in certain situations. Universally, lets face it, the best race is Taru, with Hume in second. This is largely because of our role in parties and our method of soloing, and Hume is only second-best because they cover all aspects of what a RDM can do.
I think Hume is the best RDM on paper and this is why.
Tied for 2nd best INT(Mithra)
2nd highest MND behind Elf(Mithra and Taru have low MND)
Tied with Mithra for MP behind Taru
Higher HP than taru which helps live though links/better convert.
So in the mage category, draw your own conclusions.
As for the melee category, this is trickier.
Hume is 3rd in STR(Galka and Elf)
Hume is 3rd in DEX(behind Mithra and Taru)
HP is tied with Mithra in 3rd place.
HP and STR mean more so Galka and Elvaan are the best choice here.
However, if you lump both roles together, Hume comes out on top. Mithra while very close to Hume's in most regards fall short due to weak MND. Taru's have the lowest HP, very low MND, but the highest MP and INT. Elvaans have very low MP, the worst INT and DEX stats, but the highest MND. Galka's are average enough with MND/INT, but they don't do well because of having the lowest MP pool. That's why Humes win the crown in my book. A RDM must have good INT/MND which a Humes does have plus decent HP/MP balance which they have as well.
Best nuker race... Taru, Hume/Mithra, Galka, and lastly Elvaan(Rated Elvaan dead last because they have low MP and terrible INT)
Best healer race..Taru, Hume, Mithra, Elvaan, and Galka. (MP means more than MND so Taru wins over Hume. However, Hume is 2nd place because of a slight MND advantage over Mithra)
Best enfeebler race: Hume, Taru/Mithra, Elvaan, and Galka (This is a tricky one to rate, but Hume's balance of INT/MND trumps everyone else. MND is very important to procs, but you have to figure in MP and INT ratings too.
Best enhancer race: Hume & Elvaan(IE.. AoE stoneskin)
Now before anyone says RSE or whatever, when you get to lv75 and beyond, everyone wears the same stuff. Taru's will always have a nuking and healer advantage thanks to their INT and MP. Now you might ask me why is Hume better when Taru are better nukers and healers. Because the advantage is so slight in those 2 areas that the other stats like HP play into the mix. More potent enfeebles using MND. Honestly though either race is fine, pick your favorite. I just think Hume has all the bases covered. I would hate to be weak in HP or MND on my RDM. The MP boost on Taru doesn't always mean you can use it. HP and MND are used more often especially when solo. Speaking of soloing, cures will have more effect on a Hume because of the VIT/MND calculation compared to a Taru. Edited, Jun 8th 2011 1:35pm by ShadowedgeFFXI