I used StumpWM for many years. It was great for most of my workflow and, being written in Common Lisp, you can recompile parts of it while it's running (I didn't do this often but it was a cool feature).

Sway with autotiling and a few nifty scripts (launch or focus and such) and Waybar. The combination of having scratchpads, sensible autotiling along with titlebars and the wonderful world of wayland is supreme.

i3 because it works well with few config changes.

Been using the same config since 2015 more or less.

I'm on Hyprland (wayland compositer, wl-roots based). Prior to the wayland transition I was on dwm. Hyprland offers a dynamic tiling layout just like dwm, which was my main selling point. The dev is very active and hyprland is gaining maturity rapidly (more than alternatives like dwl or river did at the time I checked it out). I also tried i3 and sway, but they don't quite cut it for me as they don't do dynamic tiling out of the box.

When I was using it, I LOVED Hyprland. It was my most flawless experience with Wayland on an Nvidia GPU. I switched off of it however, because I primarily game on my PC and a lot of games just didn't work and I did not want to have to figure out how to get them working all the time.

I use i3, but to say that I like it is a bit overstated. It's fine, does what I expect the very basic of a tiling window manager to do. I used Nimdow for a while and it's pretty good, the default bar is way better than i3 (supports ANSI colour coding, mouse presses, etc.), but I could never quite get to grips with the tiling algorithm.

I'm working on my own WM though, it's not tiling per-se, I choose to call in non-overlapping and I'm trying to solve my gripes with i3. Basically windows should not be forcefully expanded if they don't want to. Try open galculator under i3 and watch the horror. And when expanded the size should be split based on their initial sizes. So if I have Firefox open and want to do something in a quick terminal window the terminal won't get 1/2 of the screen. Firefox wanted more space than the terminal initially, so the terminal gets to take up a smaller share of the space.

i3 just works in my opinion, and I can change stuff how I like it. It's simple and has loads of users, so guides are easy to come by.

Currently using sway, but mostly for the lack of good Auto tilers on Wayland