It's a tough decision, especially if you can financially afford to do either. I'm ex Military and I used RAF flying clubs to get my ppl at a cheaper rate. From then on I did modular and used MultiFlight (Leeds) for the courses I required (CPL. ME IR). For the joc and mcc I used CRM aviation. For the ATPL theory I used Bristol groundschool. You should also have access to ELCs which will help pay for a few courses.
But as everyone has said, get the class 1 first before spending a heap of cash. Also my other advice would be not to pay everything up front. It wasn't long ago cabair went bust and people had just handed them £000s in cash.
Good luck