here's some input from an "outsider" - I don't fly big planes with large 4-strokes or gassers either one -

But as a small plane flier that watches others fly their big birds, I would much rather listen to a plane with a 4-stroke glow engine in it than a big gas engine. To me they just sound better.

I helped my Dad build a cub several years back, we flew it with an OS .48 surpass 4-stroke. It was (and is) a nice sounding plane.