I have both in the same cabinet, but now I'm building one just for VR.
Playing in VR is really cool but it is tiring if played for a long time. Furthermore, 3D vision is binocular. In my opinion, it's worth it as another option to play.
In cabinet mode, I use a 3D TV. Although in 2d mode you have good resolutions with
120hz TV, in my opinion I have the impression that it looks like a PC gamer.
I can't play in 2D.
Unfortunately the 3D TVs are out of the market. It takes a little work to readjust all the POVs to your better mode as well as Reshade to avoid divergences but it's worth it.
Pay attention to Gravy's comment below.
"There is a third option, replace one of the screens in your existing cab with an LG Cinema3D TV screen or other brand using the same 3D tech. Depending on your existing screen, it may be a step backward in resolution (1080P) and refresh rate (60hz) but it's pretty great in 3D and is full colour, just very slightly darker due to the tint of the glasses. It's also worth testing out anaglyph 3D, you lose some colour but get to keep all the features of your existing screen.
You'll need to find one secondhand as no longer made. There are also some 4K 3D screens, but they tend to start at around 49" so may need a larger cabinet build.
The other disadvantage with the polarised 3D screens is you lose half the resolution on one axis in 3D mode."
Regards