I have no experience with either of these models but I do have a fried that did have a homemade ( homemade yes but did not work or look homemade) one that did what it was purposed for.
My only complaint was listerning to the motor run + the smell of a two stroke when trolling.
My 2cents is go electric, once fitted with a proper electric motor for your boat you will swear by them. Cheap to run, no noise, no smoke, no smell and when it comes to trolling that is a good thing.
More money to set up but the +'s out weigh the -'s.