There was a longish recent thread on a mailing list where people described well ...

There was a longish recent thread on a mailing list where people described well (and linked to) why they like OpenBSD.

The most recent one I saw gave a reasonable sense of some tradeoffs:

I'm sure they welcome donations. :) Software they have written have benefited many, directly or indirectly (like OpenSSH).

...but the whole thread was interesting I thought.