I'm with RAC and i've been very happy with the service they provide so far. I have never used the AA but i've heard they are not so good, bearing in mind that your reputation preceeds you. If I had to choose now, considering i've heard the reputation of the AA but never heard a single story of the RAC, i'd go for RAC.
Heres a little semi-unrelated story. A few years back my car was used as a "destruction derby" vehicle by a bunch of joyriders - I was driving my car but I was brutally rammed, rammed and rammed off the road - my car was a write off. The incident happened at about 8.30PM at which point I phoned 999 and spoke to the police. Shortly after, I phoned the RAC to have my car towed away. Both the RAC and the police knew of what happened, but the RAC were the only ones that showed any emotional support - with the RAC making regular phone calls to both me and my mother asking if we were alright and giving me updates of the ETA of the pickup. At about 9.15pm my car was towed approximately 15 miles to my "local" mechanic. 3.00
am and I recieved a phone call from the police saying they have an officer "willing" to see me now!! Obviously I told them I was no longer at the crime scene, and they said that I "need to come in to your local station tommorow 'if' you want to make a statement".
In this situation the RAC were much better at providing a service and additional support than the police. Quite frankly the police were not interested.
Two days later when I travelled past the location of where the incident occured, some unlucky chap had his newish Subaru WRX smashed up and abandoned. What a lovely area - "gun capital" of Nottingham.
/EOR