Not to mention breeding for Albinism is unethical.. Albinism comes with a myriad of health problems.. one of which being blindness. You'll find that few people are going to be interested in buying an Albino betta.
If you want to breed whites or opaques that's a different matter. It all depends on your audience. I, for one, am not interested in whites/opaques at all but some people really like them.
As for tail types I would stick with Halfmoons or HMPK as those will be your biggest sellers.