Francis,
Can't put into words why,mainly because I don't know what struck me most about it, but I like the 3rd design better...maybe because I like the look of the finished product better, but if it were me I would go with design #3 (2 is sweet also but I also like the front deck to have someone casting from bow and stern at the same height and not be in each others way ...like it better without the side decks. Maybe because I see a little more storage area away from the waterline, etc but either one would be sweet. Good luck with it!
Mark