What is the preferred choice of paper when it comes to submitting for competitions? If a competiton states, for example, that prints should be 16x20 and unmounted, what's best to use - FB or RC? At that size, FB is going to be hard to get absolutely flat with mounting to board, but do judges expect to see FB rather than RC? I prefer FB, but that's when I'm mounting and framing. Also, gloss or matt finish?