Which Amiga set up do you use most... 
WinUAE on a USB jumpdrive. Mostly because I can take it and code wherever I'm at. Such as on the PC at work.
Next you should create a poll regarding which AmigaOS version is mostly used. Such as 3.0, 3.1, 3.5, 3.9, 4.0, 4.1 etc.