I have no experience with those models,but a couple of things to look at to help make your choice.
-Jacks,get the bigger one.
-Water pump location,how easy is access.Thinking adding winter anti freeze.
-Water tank is it inside or hanging underneath.
-Door width
-Hot water tank location,they can be noisy.
-furnace exhaust, some are on the door side some are on the other side
Just some things to think about.