It's a very personal choice I guess and engine manufacturers have chosen 2 different routes. To get a 2-stroke to be complient to emissions regs is much harder than a 4 stroke and they have to be direct injection as per E-TEC, OPTI, TLDI etc. 2 Strokes are lighter with more low down torque. 4 strokes are probably quieter and a bit more efficient) although E-TEC claims to be as efficient as equiv 4-stroke.
(to be taken with pinch of salt as it depends very much on what prop was on each engine).
I personally chose 2-stroke for the weight and relative simplicity factor although I use a 4-stroke aux so it can run off raw fuel.