2 Strokes:

1 , Initially CHEAPer
2 , Usually need HUGE ,HEAVY mufflers
3 , Even with #2 they still aggravate noise problems more than 4 Strokes
4 , Burn a lot more fuel
5 , Need to swing smaller less efficient props to develop full power
6 , Are an ever shrinking percentage of the new engine sales.
7, Do not work well with smoke systems.

4 Strokes :

1 , Initially cost a little more (but return the difference in fuel savings alone)
2, Use small ,light mufflers and often run straight pipes without complaints from neighbors
3 , Less bothersome to most people who happen to live near fying sites.
4 , Burn less fuel for similar power levels.
5 , Swing larger props at more efficient speeds that result in strong realistic flyong.
6 , Are increasing their share of the market.
7, Are putting out power approaching a similar disp. 2 stroke.
8 , Make GREAT smoke with a muffler heat smoke system.

Many 4 stroke flyers started with 2 strokers . They could easily go back.........if they wanted . The sales trends confirm most don't