I had an 18' Clipper square stern for a few years. I sold it. They do not paddle well at all - you get a vortex happening at the stern and the drag is incredible. I had both electric and gas. The electric motor was better in the sense that the weight was down below, but the gas when titled up put the weight above the gunnels and made it unstable. I did fish out of it but not the best for that, very hard to move around and stay upright.
The biggest issue is the kind of water we have around here. Think about it - big lakes (Alouette, Harrison, Stave, Pitt), big rivers (Fraser, Harrison) and big inlets (Indian Arm, Howe Sound). All of these bodies of water can have significant chop and any canoe is dangerous in them as I know from personal experience with 3ft waves in the Harrison River on a windy afternoon. Even boat wakes are treacherous, especially the jet boats that don't care you are in a canoe.
If I was going to keep it I would have added Nielsen's Outriggers for fishing.
Instead I now have a Lund 16 with a 40hp. Much better for water around here.