Extreme Exposure for me. Absolutely no question. They are always super friendly, professional and have a good attitude. Their shop is clean, well run and well-stocked.
Although I have taken some GUE training and often dive with GUE divers I really don't consider myself a GUE diver. It has no bearing on being welcomed at EE or not. They have always treated me with kindness.
Other dive shops in Cave Country will certainly be able to accommodate you and I'm not going to sit here and badmouth other shops. I just have my own preferences.
One big plus for CCDS is that they bank trimix which is great for CCR divers. If you want trimix at EE you may have to wait a day or leave tanks if they're busy but that's not always the case.