i voted yamaha, personally of all the motors that came through the various dealerships i worked at, never saw a blown yamaha. lots of mercs, lots of omcs, not one yamaha - would i buy one, don't know, probably still go black - only because parts are quick to get.
my brother in law works for suzuki - let me tell you - they are a fantastic engine - smooth - powerful, but they need a larger dealer network before they'll see any inroads in canada.