regardless of riding style that Rossi is the best board of the bunch. The Morrows are very low end and Dub doesn't even make they're own boards... I believe they're made by 5150 but I could be wrong on that. Rossignol even if it's a lower end board will have a much better build quality than the other 3.
he rides both park and free-ride. he is a size 10.5-11 shoe. as for what he can do,he ride switch perfectly fine and do some 8ft jumps, tabletops, rails and boxes. besides that i dont know anything else.
is the rossignol rpm a really low end board or is it decent for a beginner/amateur?
It is a bit of an "entry-level" park board and from the sounds of it he may be more advanced than this board. What type of budget do you have to work with? Let us know and amongst the members here we can probably give you some viable alternatives to look at that may be a bit better for him.