I know somebody who went to both BGS and BCFT. He did half of the subjects with Bristol and half at BCFT because something popped up and it would be better for him to learn at home, hence the switch. He got much better scores in the subjects he did with BGS and preferred Bristol instructors. I asked for his opinion on BCFT and he said they were really good and instructors are great but did prefer BGS.
OAA ATPL course looks good too.