Most of my recent engine purchases have been 4 strokes. I view their pros as being quieter, smaller muffler, better fuel efficiency, and able to run larger props. I use 2 strokes when I need light weight, higher speed, or just because I already have the right size. Operation is essentially the same as a 2 stroke. The only differences I've seen are occasionally adjusting the valves and being more careful about using after run oil.