MMG
I'd say SFT. In my opinion, having completed a JAA frozen ATPL and CPL/IR with them and now working for the last three months as a groundschool instructor, with colleagues who have worked at each of the other major schools, SFT is the best of those that offer both ground and flight instruction. If you are self-sponsored this is even more relevant, as you are not placed below sponsored students, as we have none.