There are a few possibilities for running an AmigaOS or a derivative either already available or in the works.
What do you see yourself using in the future and why?
Do you mean specifically Amiga related usage? If so, then I'm afraid none.
I've gone Mac about 3 years ago now and never looked back. I run Parallels for the one, single task I can't do under MacOS (a news aggregator program), and I've got WinUAE loaded but literally haven't fired it up in... well I really don't know how long it's been...
About the closest I think I'll get is looking for a CD32 in good condition and a few fun games.
In my truly humble opinion, I feel the time for AmigaOS to actually move forward has passed by with a whisper. Unless a multi-billionaire wants to have a weird hobby/tax-write-off of rewriting AmigaOS for real hardware (non PPC) like Apple did with OS X, I'm afraid we're going nowhere.
That is to say this is MY PERSONAL opinion.
That doesn't mean that anyone who still enjoys AmigaOS should change in any way. I simply can't think of a single, legitimate use for it any more, which is a shame because in 2000 when the current reign started, I could still see a huge market in embedded devices and things like TiVo clones.
Unfortunately that time has passed.
Wayne