Given the body size and weight of most Roe men and women... I'd say they would be able to drink more than the other races pretty handily. I mean, the lalafell's would probably get two drinks in and pass out, the McCatz and the Hyur would probably do ok, with the Elzen doing a bit better probably and the Roe being at the top.

I mean, if we took 1 of each race who was a hardened drinker and had the same amount of experience drinking booze from a young age and maintaining a certain blood alcohol level I would say that the Roe would still win hands down... They're just so big!