>>955584 (OP)
Unless you're far down the rabbit hole, Gentoo is by far the best OS for your desktop if you're already used to it.
OpenBSD, in my opinion, is the better OS but it's heavily stacked for servers, not desktops.
Your best bet is just installing it on some spare hardware or a VM.
Also, I doubt Theo has been putting backdoors in the system.
1, the system is heavily audited and completely open source. He'd have to be fooling several security auditors to be slipping in backdoors.
2, he's a huge dick about the system, to the point where you can't deny he views it as his magnum opus. It's unlikely he would ruin his own life's work.
3. So far OpenBSD has been completely absent from all FBI leaks, some even listing exploits in other BSDs