All I can tell you is this:
Pricing is all very close on brand specific items and everyone runs their X% off now and again. If you have a big order (few hundred $) and call any of the distributors they will work with you.
Who you buy from is most important and I can tell you that Detailers Domain has the fastest shipping of anyone. Every single order I have placed has shipped the same day. Even orders after Noon. I placed an order Friday afternoon and was not expecting it until Monday. Saturday the FedEx guy delivered it. The packaging is great, no damage or leakage. Way back in the day I did receive a damaged Sviss Wax Pneu and it was replaced quickly. They have earned my business as a customer and a happy one.
Autopia is also good and Ray is excellent but shipping at times has been slow mostly because the orders don't leave the building for a few days. I don't know about you guys but once the order is placed, I want it already. (is there a big crying baby emogy?) I am also not one for joining clubs where you have to pay extra for service. I want the service for being a customer. I know there was a give away for the value of the connect membership but if its not something I need, I have 2 lockers full of detailing stuff already I wont use in this lifetime. I am looking for something better continually. its dumb, but its cheaper and less dangerous than many other hobbies I could have.
I think people deal with people they are comfortable with and who they can get expert advice when needed from. The short list of peope I count on for advice is:
Companies:
1. Autopia
2. Detailers domain
3 Car-Pro USA (Corey has always done right by me)
The people:
1. Ron H-who got me started on this in the first place
2. Mike Lambert who shares with everyone here selflessly
3. Phil from detailers domain who answers my questions via email in great detail
4. The AF forum crew who have been great
5. Todd H-the man the myth the legend-still miss his epic posts.
Word has it there is going to be a new Gyeon-Us full distributor for Gyeon similar to CarPro-Us. And all these other companies will simply sell it as well.