Brand names etc. The following is my opinion and it is based on close to 30 years of professional boat building. I used and tested three brand names of resins and tried a couple other ones. We always experienced good results with WEST System and System Three . These two companies exist since more than 20 years, offer great technical support and are very reliable.
Quality is consistent.
WEST is much more expensive. The difference in price may be justified by more tech. We did not test brands like MAS and other new comers but since three years, we tried resins from RAKA Marine on some of our prototypes. Their resins performed well but their prices were very close to System Three once shipping was included. All these companies propose at least three different speed hardeners and non-blushing resins.