I've done both a few times. Frenchmans is generally too fast to row against, it actually has some white water in the lower stretches. Winchester is slower, you can row a canoe upstream for a bit, but I wouldn't want to have to do it very long. People run Winchester with small boats with jet drives or mud motors, especially from Dodson down to the first big lake where all the duck blinds are. It's deep enough for a prop in most of the main channel, but it shadows up at the inside of the turns, and there are hundreds of them, so I would think it would be tough to run any long distance with a prop.