IMHO, VR all the way
And while on the subject of trying VR: if you jump straight to DCS world instant free flight action, you will probably be motion sick. Start slow, with some stationary demo, no free camera roam, and most importantly, none of these "rollercoaster experiences" - they will make you puke or strongly nauseous at best if you are a "VRgin" ;-)
As for me the immersion is unbeatable. I have a Vive, and a 55" 4k OLED display. And while 4k is beautiful, it's... just like looking at the window instead of sitting in a plane. For me, once you try VR, there is no coming back. It's a childhood dream come true, and probably the closest I will ever be to sitting in an actual fighter jet.
Also, ED said once that they are "cooperating" with makers of Pimax (chinese headset), and Pimax started to send out beta testing units recently (
). Pimax has higher resolution than current headsets on the market and will use Vive lighthouses (steamvr tracking system). It utilises two 4k panels and a massive 200 degrees field of view, though the signal from the gpu is 1440p, so it upscales things to 4k. Still it should improve clarity much. I'm actually waiting impatiently for the beta testing NDA period to end and SweViver impressions with DCS World. Based on that, you might want to wait, or get a discounted vive (NOT PRO) to get the vive lighthouses and controllers and you will be "future-proof" if pimax proves a success.
Bottom line - for me, playing DCS on the monitor, even in glorious 4k with head-tracking (I have a trackir clone) is like watching an (interactive) movie. I _think_ I also tried 1080p 120fps mode, but still it is simply not comparable to VR. In VR it's sitting in the [censored ;-)] fighter jet and actually flying it. Those are apples to oranges in my opinion, and VR wins hands down for me.
PS: As
, it's simming vs actual flying.