I'm a bit of a ThinkPad freak, and since i386 will no longer be supported in the next 15.x release of FreeBSD, I've decided to move my 32-bit machines to OpenBSD. I have quite a few of those laying around, including the X41, X41 tablet, X60, T60, R50e, and
You will find both are very similar to each other, especially for common tasks. See: https://www.openbsd.org/faq/
I have OpenBSD on a R51e and had it on a T61. No issues except sleep and resume. R51e fails, T61 works except on resume you loose your USB ports.
Now NetBSD works great on the T61, no issues. The R51e I kept with OpenBSD.
Also note this quote from OpenBSD: “… only easy and critical security fixes are backported to i386”
https://www.openbsd.org/i386.html