One advantage is it's not likley to be hit and damaged by anything thrown up by the tyres, especially on a rough strip or gravel strip. I fly a T tail and one thing I find very annoying is the fact I can't see the top of the elevators on the walk around. Also T tails don't perform quite as well in stalls, infact if the stall is deep enough there is a risk you won't have enough elevator authority to recover.