I visit CCDS as my main dive shop, they've been nothing but nice to me. If you are looking for advice, you are most likely to get a more experienced opinion at CCDS. All their employees I've seen are experienced cave divers in the community.
I occasionally visit EE when I need stuff only the sell.
Amigos is a bit out of the way for me, I only visit them if I am diving the Branford area caves. The new owner Bruce was fairly attentive making sure the banks were filled, and was making changes so there is more room to get fills
I don't really visit DO since Kathy retired. The GSD that they have is very aggressive and has snapped at me, that makes be wary coming from someone that like most dogs better than I like most people. And despite being a gun guy, not a big fan of open carry particularly their reason why.