A matter close to my heart having just spent half of last season in
Greece solo med mooring between crew changes etc. Some cat designs are far easier to med moor solo than others. Some are basically impossible in all but zero wind. Things you will need to look for are -
1. good vision to all 4 corners from the
helm
2. close proximity of helm to stern lines and their
cleats to be able to comfortably make the dash from one to the other
3. anchor
winch control at the helm or a
reliable remote
4. the lower the windage on the cat the easier/safer it will be as the wind pipes up.
5. sugar scoops will let you pick up a lazy line solo if no one is there to hand them to you
The dual aft helms are hands down the easiest set up to med moor solo. You can remain at the helm and exchange stern lines and even lazy lines, you have the best vision of the rear corners and if you have throttles at both helms then you can pick the side to operate from depending on wind direction, obstacles etc
Ive seen an experienced
skipper solo med moor a 52 foot
catana in 25
knot cross winds for example.
On the other hand Ive seen one poor
skipper trip and brain himself trying (for the third time) to dash down some stairs to get to the opposite stern in 10 knots of
offshore winds. End result was damage to his boat and the one next to him as well as the gash to his
head. (technically he was with his wife but she was not much help being stuck at the anchor
winch the whole time and unable to suddenly take over once the skipper was down)
Some bridgedeck helm cats are easier than others - just think through the path you will need to take to get to the opposite stern and how long that may take, how many obstacles and trip hazards as a quide. Flybridge helms would be a no go for this reason alone.