Up to you - people swear by both. I have both and rarely use VR. I love my TrackIR setup.
For me, TrackIR is very easy - I just put my hat on that has the clip, and I'm good to go. Getting VR up and running each time seems cumbersome, as is the device itself. With TrackIR, it is much easier to check your six. I can also still see/hear my wife/kid (that may be a pro or con depending on your perspective). I can also still see the keyboard, which is a big one for me. I'm also prone to motion sickness, which is a factor in VR but not TrackIR. I also have a 1440p ultrawide monitor which is awesome, so resolution is much better than current VR.