My general observation over the years is that you tend to see more Mercury's on lakes/freshwater and more Yamaha's in salt water.
Most modern outboards are pretty darn reliable and you really can't go wrong with any particular brand although certain models by certain manufacturers over the years have been problematic.
I currently own a Yamaha, Suzuki, and small Honda. I like them all.
With that said, if given a choice I would go Yamaha (especially the F150). I am on my second boat with an F150. It's rock solid.
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