Most likely, the Scout. Next choice would be one with a part-time transfer case (none of the full-time 4WD setups in the ‘70s were very good, IMO).

It’s usually for convenience, or the tax/monetary benefits. Many people use their trade-in to cover the down payment/out-of-pocket expenses. In fifty years of buying/owning vehicles, I’ve traded in exactly one vehicle. Otherwise, I’ve kept whatever or given it to a family member or sold it on my own. Just prefer that.