Eh, it takes 5-10 minutes to install OpenBSD, it's very straightforward. The installer requires little more than tapping return a few times and entering a root password & optional user at some point. I've yet to see a Linux distro that is so fast and simple to install.

This depends on what you need out of it. I found it difficult to install despite being somewhat technical at the time. My goal was a secure desktop install.

Probably Slackware. Quite similar to OpenBSD although I did have a hard time with driver support. But if I remember correctly, installation was blazing fast and you'd get a barebone system up and running in no time.

Totally agree. I recently moved away from Debian after using it and OpenBSD for various things both at home and work. After trying a few different distros I gave Slackware a try because I had used it years and years ago. I bought a book, think around 1995, that came with Slackware on a CDROM so it was my first experience with Linux.

I was pleasantly reminded how much Slackware still resembles BSD in how it configures things and it's emphasis on a minimal install that can be added to as needed. Other than new apps, a few improvements and, of course, updated hardware support Slackware has changed surprisingly little since I used it in 1995!

Patrick Volkerding is a great maintainer and I really appreciate his efforts over the past few decades!

Slackware's certainly fast to install once you've gotten past partitioning, but partitioning is one of the things Slackware intentionally does not do for you in the installer. OpenBSD's a bit easier in that regard.

Thank you for your answer. I'll try it on some old laptop.