That depends on the water you are fishing. If you are squeezing through tiny shoots, and avoiding rocks like it your job (like you are using this in the susky) the smaller boat will be more practical. It also depends on where/how you are launching this thing (do you have to push it off the trailer, but I don't really see pushing either on of these sized crafts very well)
One the other hand, I would think, even at a foot longer, a 60inch bottom will draft in less water, if the boats are made the same (decking, hull weigh etc).
Honestly, a boat ALWAYS seems smaller once you get it on the water.
Also, what are you powering these hulls with same motor? or do they come with a different motor each?
IF you aren't using this in a super rocky environment, I would probably opt for the larger boat...
If you give some more information about where ya fish, motor size, etc etc etc, maybe I could supply some more insight from my point of view.