Not knocking anyone in the area, but I've flown at a few of the establishments mentioned.
The standard of instruction was fine at all of them.
However, I made the choice to pay a little more based on the fleet. I fly well equipped modern aircraft where everything works, and I've never had a cancellation because an aircraft has gone tech.
I really do understand that every pound spent on flying is really tough on a lot of people - it was for me for many, many years (it took me five years to get my PPL way back because I really couldn't afford it).
But I would suggest that if you can afford it (a big if, I do understand), fly the best fleet you can. You'll enjoy it so much more.
There are a lot of old, tired airframes out there that are perfectly safe, but you'd never want to drive a car with such knackered interiors and ancillaries that just dont work.