They are a much more sociable and friendly club and I'm sure they would love to have you join. They do have some pretty good runners - I've been beaten by loads on Cotswold Way and other local races. That said, the more natural fit for a strong runner would be the Harriers - so suggest you try some of the sessions to see what benefit you will get first, and how seriously the club takes its effort sessions. I say this having just left a club where the intervals were not too structured, turnout was low, and most of those that did come didn't seem to try very hard!
Good luck with any change of club paperwork if you decide to change!