I have owned a 68 H with long-range tanks and a 54 with an O470-A now with an O470-R. I have also flown (borrowed) a 185F a lot and a C180J some years ago.
The H was much heavier on the ailerons and the elevator than the 54. Not sure what year the down spring was installed but that does make a difference to the elevator feel.
The H could carry more, was faster and had longer range. Centre stack radios are great and the 5th & 6th seat option has been used occasionally. It flew like a truck and was a dog on some of my shorter airstrips. Personally I usually call the H a C185 with one missing cylinder, the J model was even worse, but if I was working one for a living I would go for the 185 then the H or the J with the 520.
The 54 is always short on fuel but manageable with planning, it struggles with the big loads but I don't fill the seats anymore. It is a clean standard wing with no mods. The 54 handles like a dream and is very light on the rudder and elevator. The A engine was great but parts were hard to get so changed to the R engine.
In the end I kept the 54 as it just fly's so well and is light on the controls, it leaps off the ground and just fun to fly her. It is just me and the boss most of the time and we don't have a big load usually so it suits my mission perfectly.


Just shows how well balanced the Skywagon really is.