Originally posted by kypfer
I don't have two bodies the same, but I do have a variety of Pentax DSLRs, most of which get used as the mood takes me or to take advantage of a particular feature or capability.
My situation and way of use too, except I do have two KP bodies, both bought new in discounted lower-cost bargain deals. As to the OP's question, the way I handle this is to use both about the same. I currently have one with the largest grip on it with the sizable, heavier Sigma 17-50mm f/2.8 EX DC HSM fast zoom lens mounted, while the other has the smallest grip on it with the DA 20-40mm f/2.8-4 Limited mounted. Of course, this is not carved in stone, as I do change to other lenses, like a small Limited prime on the one with the smallest grip, but having the different grips is a convenience when deciding which lenses I will be taking out.
I rarely have need to carry more than one camera at a time (though on occasion I do have such need), but I do travel with more than one body- often 2 or 3 different styles or types.
I also operate according to the reality that by using both cameras, both will last a lot longer, and will ensure that I will still have a KP available for a very long time. Actually, I've been doing likewise with cars over the last 2 decades or so. Upon having found a model I especially like, I would buy another (with cars, I always buy perfect, low-mileage used), and alternate using each a few times per year, having one in mothballs, transferring full auto insurance to the one being used. This way, mileage creeps upward much slower when usage is divided between them, and they last for many years.