These days it doesn't really matter which one of the ones listed you go to they are all proffessional excellent products.
Look more about which one fitts in cheaper with your situation.
For example in my day i had a choice and the reason i choose oxford was there was a direct flight into lhr and an easy bus to get there for ground school and the big picture including all the hotac and transport was cheaper than BGS.
Most only have experence of one supplier and the one they say to use will be that one.
So i am saying do a spread sheet for each one including transport and accom for you and use that one. The training product is high for all of them.