I can answer this now
Had my last bike done by All Year Biker in Newbury a while back, and just had the GS done by Cotswold, I am not going to say either one is better, worse or whatever, they are a bit different in service and price so make up your own mind.
The AYB offering is a full Valet, my bike was cleaned completely, then dried completely before the ACF50 was applied as a fine mist, which is how the US Navy do their carrier jets, lastly the bike was polished. The end result was a bike gleaming like new with a fine layer of ACF everywhere. At £60 well worth the money and about two solid hours work.
Last Friday I had a yearly service done by Cotswold, I had intended to get AYB to do the GS, however it would have meant another trip to Newbury, so I decided to get it done by Cotswold at the same time saving £10 in fuel and £10 on the cost.
They serviced the bike and did the ACF in less time that AYB did their "thing", when collecting the bike it was dripping wet, certainly it had been washed off and was pretty clean, not AYB clean, but good enough, but it was still wet and had not been polished, but I guess for the £20 I saved I can dry it off and polish it myself.
I did not see the Cotswold application method, but it looks sprayed on in the traditional way as it was pretty thick in places to the point of running lines, I would guess the AYB method gets into nooks and crannies better, but I am in no doubt either service gets a good amount of ACF where it is needed most.
