Compare the specs carefully - probably identical motors with different fuel calibration. So it’s likely just $$$. (The Tohatsu 8hp & 9.8HP are similar also) since weight & size is usually the critical factor, so as long as u don’t exceed USCG rating, should be no problem with extra power though for 2 light people and usual loads, 15 is plenty ON A 10ft RIB
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Jeremy
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