Definitely go and ride with and talk to each club before you make a choice.
I drifted away from my club in 2012 because I was no longer interested in time trialing, and they didn’t seem interested in what I wanted to do instead.
Also worth finding out where their club rides / social evenings are, as this might not be anywhere near the theoretical location of the club ie Bournemouth Jubilee rides HQ is Wimborne, 10 miles from the centre of Bournemouth.
Having said all that, I’m seriously considering joining a different local club – Wessex RC – this year just because they have a nice retro style kit :D