Why not hunt them both at the same time? They are in season at the same time at least in CO and MT. Granted it isn't the best time of the year to hunt the mulies because they are not rutting, but they won't cost you any extra at many places (outfitters that is) aside from the license. If you are looking at CO, PM me if you want some info on a really good and inexpensive place to go. I have been there 7 times and my dad has been going there for 30 years.