Hi there,
Did both the CPL and IR with Aeros last year, gaining a 1st time pass in both. The standard of the instrucution was excellent. For the CPL one distinct advantage is Gloucester has 6 available runways so only the windiest days will see you grounded. Also it was very rare for the circuit to be too busy to accomodate training. Sadly this is not the case at Bristol as its a far busier airport. BFC have the backup of being able to transit over to Kemble (about 30nm NE) to do their circuits. A perfectly reasonable situation but not the best when the weather is crap for nav but fine for the circuit at the base airfield. The opposite to that argument is that BFC are based at the local CAA exam centre for the IR. So if your with Aeros you will do transit lessons landing at bristol, then conducting a route out of BRS. Again not a significant operational problem.
Both schools benefit from a reasonable size fleet and in-house maintenance.
The best advice as always is to visit both schools if you can and see which one is best for you.