Because of the ubiquity, nay, monopoly of systemd I always assumed it was miles ahead of other init systems. Nope. I've been using a non-systemd environment for a while and must say I'm surprised by how little breaks, i.e., next to nothing. Moreover, boot and shutdown times are faster. I'd suggest trying it out.
OC writeup by @arsCynic@piefed.social
If systemd is taking a long time to shut down it's probably waiting for a process that didn't exit when it was supposed to. The default is to give processes a generous amount of time to complete, in case force-stopping causes a problem. Other init systems might be more aggressive about force-stopping. You can configure systemd to wait a shorter period of time by setting DefaultTimeoutStopSec