Tohatsu makes all mecury and nissans under 30 hp. The only thing different is the label. You are basically paying more for the mecury and nissan labels. Check out this link: https://www.onlineoutboards.com/Help.html?Question=Nissan-vs-Tohatsu
I picked up a Nissan 18hp 4stroke back in 2008 from onlineoutboards.com for my 16' jon. This has been a great investment, she's smooth and quiet from trolling for muskies to wot to my next fishing hole.