I use Sway. The main reason is because I'm used to tilling WM, I've tried to switch back to stacking ones a few time but I really don't like it. The second reason is that it's light. The third reason is that I have less issues with Wayland (I know some people would say the opposite, but I never found a way to have no graphical glitch with X11)

Now, if there would be a mature dynamic tilling manager like DWM or AwesomeWM under wayland I would switch to it (I'm gonna play with RiverWM soon I think).