both are great foundations, both are silicone based and both are industry standards. I find the cinema secrets is a bit dewier then the RCMA. RCMA has more of a natural matte finish to it. so it really depends on the finish you want. both have the same amount of coverage, and can be sheered down with a moisturizer.
Both have been around for a very long time and you can always guarantee they will have your color, and not change the formula, its been the same formula for years.
HTH