This is a pretty wide subject... but some basics: There are one man canoes
out there faster than your kayaks, but they don't carry gear well etc For
solo, a 15' is good for flat water. The longer, usually the faster, but
also heavier. The more blunt the ends, the slower, ( narrow ends cut water a
bit better). If you have to travel 10 miles with camping gear then a light
fiberglass is good. Are you out for cardio workout? of wanting to go
fishing? Plastic is durable, glass is usually more high tech.