Cuda416,
The 3 top Tier OEM and Refinish paint suppliers are BASF, Dupont and PPG (in alphabetical order). You can't go wrong with the quality and durability of any of them. PPG provides the best technical support of the 3. I don't know where BASF and Dupont's tech support went but it's nowhere near what it was when I was in the game.
I use the PPG Shopline bc/cc solventborne products. When BASF had the Diamont low solids bc/cc system line I used theirs all the time. Dupont had a good high solids bc/cc refinish solventborne system but it wasn't as forgiving as their competitor's products.
Sherwin Williams is catching up to the top 3 in refinish materials. The rest of the refinish paint suppliers I can't comment on. I haven't evaluated any of them in quite a while and their product lines have changed.
BTW- don't forget the catalysts when you order your paint. Material amounts needed may change depending on "black and white" hiding specs of your bc. And clearcoat usage for a complete repaint is normally around 1.5 gals, at least it is for me. If you use all the same name brand materials you are less likely to run into paint defects. Surface tensions differ between layers and down the road they may show up.
My 2 cents for whatever it's worth.
ss