josh,
Its a personal thing, go to the school that you think will work best for YOU. Once you find a school (post ATPL groundschool), try to stick with them, going to a bad school will probably be less of a problem than going to several, (one for multi, one for CPL, one for IR etc) as its fairly important at that stage of the course that your training is 'monitored' not easily done if you're flitting from provider to provider.
But then you'd know that from all your questions on the ASK Oxford forum right?
Kind Regards
CR