IMHO, both those boats are pretty heavy for solo cartopping. it can be done but there are better. My first suggestion would be to stay with royalex or similar material. It will give you the combination of light weight & impact resistance you'll need. Many of these boats will weight well under 70# and some under 60#.
FWIW, my current favorite fishing canoe is the OT Osprey 155. 56#, center seat (handy tackle tray when paddled backwards), 38" wide for stability. Keel less so its WW friendly. Can be rowed ,powered or paddled.
Also FWIW, used Royalex boats are not hard to find and a bargain when you do.