You may want to ask yourself this question "how many Yamaha engines were stolen in the last 3 months and how many Suzuki engines were stolen?"......both can be easily maintained.
Although an overwhelming number of responses are for Yamaha, I am wondering if that is because there are just more Yamaha's in use in Belize. My question was posed as a "can I get either one fixed easily if necessary" one. I know that Yamaha is the 800 pound gorilla in outboards.
Finding mechanics to work on either one of these engines should be same-same, as both engines are purpose-built for the same function. I would think that an outboard is an outboard, in terms of how they are repaired and maintained, and that a decent mechanic could fix either.
I guess that the real question is: Are parts more difficult to source for Suzuki than Yamaha?