I use Thera a for growouts and smaller fish and Mega and Jumbo formulas for the bigger fish. The fry formula is pretty useful with fry in the tank with the folks.
I've been happy with Hikari Gold and Massivore Delite.... never tried NLS as none of the lfs (5 or 6 stores) sell it around here and I'm not going to order it online and pay for shipping. I've been on MFK for a lil while and whenever a thread like this comes up, NLS is most always at the top of peoples choice of pellet... it must be pretty good.