I love obsd A perhaps unjustified amount, but not because it's security, I like it... well it's hard to explain, it's a small understandable system, but it's not a minimal system, there are enough built in services to put any linux distro to shame but they are all small, well built, well documented services, the OS as a whole hits well above it's punching weight. I find obsd makes for perhaps the best unix desktop system, but I don't mean desktop how mac or windows or even the linux desktop environments mean desktop. It is far simpler than that, I mean unix command line, window manager only style desktop. There is something about it, something that I find hard to put into words, but may be best described as comfortable.
But honestly, despite all that it's mainly what you are used to. I tolerate linux, it is one of the good guys, fighting the good fight and all that. But I still find it a bewildering mess compared to obsd. I am sure a primary linux user feels the same way about obsd.