I'm pretty set on a specific era of retro Mac programming.
Black and white compact macs targetting mostly 512x342 in 1-bit color depth field
BUT
-must not crash if a more recent machine is used
-System 7.5.5 is the most recent that I target
-When possible and not too feature rich, System 1.1 on a 400k MFS disk should run my stuff
-must gracefully center the image if a higher res is used
-must deal with color depth field if it's detected but still use 1-bit gfx data
-must deal with gracefully using graceful detection routines
-great if a Mac128 runs it, but not a big deal if not.
-great if a Mac512 runs it, it should in theory but I don't own one.
-Mac Plus is the natural main target that I can easily test out on real metal
For these reasons and because I LOATHE spending/wasting time learning how to set up new dev environments, I'm settled on Symantec THINK C 6.0. I know CodeWarrior has a lot more fans and that's fine for Sys7/8 color programming, but it ADDS hurdles for my early mac targets.