Yammi... It's not even a contest. Look... in their day both were reliable engines... BUT.. the one determining thing is the salt vs fresh. ANY engine, if properly maintained will give you years of service, but salt does things to an engine that are destructive and cannot be repaired... corrosion will eat away the metal, eventually, from any engine or ship. Given that both of your choices are the same HP, for the reason that Spare mentioned and for the reason of the fresh water there's really not much of a contest. Go for the Yammi, but remember that any used engine is a crap shoot.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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