If you have an option, go with a foot-controlled motor. I used to have a foot-control troll motor on a 17' Key West and it was grrreat like frosted flakes. It took a little getting used to, but it leaves you free to fish/smoke/drink with two hands. I don't think you necessarily need a 24V system on a boat that size, but it sure is much nicer.
For some stupid reason, I opted for a hand control on my 19-6, and I have to say, I hate it. I basically have to kneel down on the bow to use it. It's better than having no troll motor, but foot-control is definitely the way to go.