Check the cargo capacity on either one. What do you need for cargo capacity? We needed a lot so we stayed with triple axle models. Our Spartan has a CCC just over 6k. If you only need 3k or less, then doubles might be good enough for you. It all depends on how much gear you take with you and if you need to carry water & fuel for the toys and what kind of toys you carry. We normally have about 1500# of just normal stuff (clothes, food, camping gear, etc.) then we also carry two large motorcycles (sometimes two full dressers), sometimes bicycles, water & fuel for the genny, so we decided we needed minimum 4k# worth of CCC, and preferably 4.5-5k.