I would guess that there are a lot more sit on tops and inflatables than traditional sit in kayaks today. I have a 17 ft Old Town Discovery Canoe. It is a great boat, but heavy to handle for one person, and catches the wind. It is nearly impossible to handle, in the wind, without weighting down the front. I have a 17 foot inflatable Sevylor Ocean Kayak that catches far less wind, and is much easier to handle. For the average person it is far more useful in a wide variety of conditions;ocean, whitewater, sailing, wind. It has a self bailing option also. It is easy to use with a sail, with no outriggers. You can sit on the side of it if you wish. It carries over 800 pounds as well as the canoe. It will take three people, two paddlers.
The canoe has an advantage if you want to carry it on your neck, but I would rather drag the boat anyway. I am not interested in portaging much, but would like other opinions on dragging versus carrying. I would use a harness to pull it, and appropriate dolly.
I also own a sit on top, which is my main boat for individual use. SOT's come with up to three paddling positions.
Canoes are great, with buoyancy bags strapped in, but that uses up a lot of the space. I have seen white water canoeists, using the kneeling position, and the buoyancy bags. I am not qualified to comment on the pros and cons of that. There are kayaks made specifically for any kind of condition also. Not so much with canoes.
EZ Launch™ Kayak & Canoe
Free Standing Boat Racks
1 Canoe/Kayak Trailer