GPU passthrough on laptops with integrated+Nvidia graphics is a bit dodgy, I haven't been able to get it to work. It's not like a desktop where you just have the iGPU somewhere and the discrete GPU elsewhere with different ports, connected to different displays. On laptop the display is kind of connected through both GPUs all the time, the Nvidia GPU goes through the Intel one.

Or something like that. What it boils down to is that virtualising with GPU passthrough is really difficult on this kind of laptop. I do virtualise tons of stuff on my desktop.

Relevant for OP, OpenBSD does have a native hypervisor that works very well. It has been included in 6.1 and 6.2 and is getting more features all the time. Obviously it's still lacking compared to the very mature solutions on Linux, but if you don't need to be on the cutting edge, it's very workable. If this is a use case you're interested in, you have a non-zero chance of being disappointed.

This is amd64 and i386 I'm talking about, though. On sparc64, for example, OpenBSD supports LDoms while no Linux (other than Oracle Linux, ugh) does: OpenBSD is hilariously far ahead of any Linux in that case. Except maybe Gentoo, but I'm only saying that because I haven't tried it.