( I know that it's an old thread, but I'll leave some tips for anyone who still looking for answers in a near future )

Running OpenBSD ( current ) here on my Thinkpad x220.

Well, BSDs at all are less hardware flexible than GNU/Linux... So the first thing to do is to double check if your machine is well supported by your BSD-weapon-of-choice. FreeBSD and NetBSD have a good hardware compatibility matrix ( FreeBSD more than NetBSD ). Under this subject OpenBSD had great improvements during last years.

About Linux compatibility, the OpenBSD is the only one that doesn't have any kind of emulation ( since 6.0 ).

About speed, well... FreeBSD and NetBSD seemed kinda fast to me. OpenBSD, on the other hand tends to be less performance focused.


I had no previous experience with DragonflyBSD.