the mh is a way better option, not only do mh's run more efficently but they will produce much stronger plants, plus you can hang it higher so you wont need to mess with the lights on a daily basis, the only time you should use t5's over a mh are when you have a height limitation or something like that, plants like a bright point of light more than they like spread out light, besides those multi lamp t5 fixtures are quite pricey, for veg you could use the 1000 on a light rail and cover more space than you could immagine with that single light, sorry but if this is even a consideration then mh it is