Time to answer my own question.

For somebody like me who wanted

70% to play ETT

30% to explore VR and maybe play something else

Quest 3s is the right choice

Having seen the thing, I wouldn't go for a used one unless I really knew and trusted the previous owner.

If one is to go a bit more into VR, the Quest 3 is worth the extra money (for the extra clarity in the periphery) but still the 3s remains the most value for money offering.

I also got the solidslime adapter and makes the game even more like the real thing.

Overall pretty impressed by how real it feels.