Voted for 16:9 triples, but I would have voted VR if there would be any support... Edit: Changed vote to VR!
I use a 21:9 2560x1080, works well enough, wish I had three of them though and a PC strong enough to run them, even better if they were a higher resolution.
I have two monitors, because it makes the coding process faster, but I still use only one 16:9 screen for gaming.
16:9 50" tv, but my dream is triple. i'm waiting for raceroom support. this is a test video which show the visual.