Do you really prefer webcam + opentrack over the trackir? Asking because I literally have a trackir on the way to me in the mail, and most discussions I could find were at least 2-3 years old.
I guess so, given I have my TrackIR in a box!
That said, I have had issues with opentrack that involved some mildly irritating troubleshooting. Namely X4: Foundations didn't work properly with the standard freetrack output regardless of how I configured it, and I ended up needing to use "UDP over network".
I've never had a comparable problem with TrackIR, in spite of using it with a wider variety of titles over a longer period. I do kinda like having it as a backup in case more intractable problems crop up.
I have had a TrackIR 5 since pretty much release which I used religiously for flight siming. I also have a tobii eye tracker. I have pretty much stopped using the trackir entirely now in favour of the eye tracker + opentrack. It is incredible, works flawlessly. You have a very small amount less horizontal turn tracking, but honestly your head has to be comically side on for you to notice the difference. Perfectly smooth and predictable. Lately been using it in Nuclear Option and it’s changed the game. TrackIR also works great, and is also flawless, but the key difference is the eye tracker requires zero hardware on your head to work. Even works through glasses.