Good advice from Mr Wittingham, he did not recommend his own groundschool at Bristol which is excellent.
Oxford and FTE(Jerez) are well respected by airlines, some of which prefer the formalised integrated course.
Lots of airlines also respect the modular training, it depends who is doing their recruiting.
Stapleford has a good reputation, and should be getting brand new Diamond twins soon. You don't have to do the whole 737 course with Astraeus, it works for some people and not for others.