I have a 150HO etec and love it on my 5.7 stacer bowrider. I doubt any 150 4 stroke would come close to matching it’s performance. It has a nice note to it, still pretty quiet and no fumes.
Although if I was just fishing and trolling I might be tempted for a 4 stroke. I’d be looking at the number of cylinders and displacement compared to other similar sized engines and getting the maximum hp the boat can have.