I guess that would depend to some extent on cabinet style and what you are trying to remove or finish. If these are new cabinets and you want to give the wood a final sanding, the ets, dts or rts all should do fine. If you are looking to remove old varnish or paint, I would recommend an RO or ETS to start and the dts/rts to finish. I use an ets125 to remove stock and finish off with the dts. Don't discount the dts for its small size or type. That thing is really handy. Makes sanding out corners so much easier.
Hope that helps. BTW I wouldn't use a belt sander at all unless you are removing tons of paint or varnish. Even then the belt sander isn't the best option sometimes. Too much heat and goo buildup on the belt.