Slackware 15.0 Beta (current branch) released earlier this week, and it's
shaping up quite well. From the ChangeLog:

Mon Apr 12 20:07:12 UTC 2021
I'm going to go ahead and call this a beta even though there's still no fix
for the illegal instruction issue with 32-bit mariadb. But there should be
soon (thanks ponce!) No build regressions noted with the official gcc-10.3
release. Please report any new (or old) issues on the LQ Slackware forum.
Enjoy! :-)

I've run Slackware64-current now for over a year, since the upgrade to
kernel 5.4.x and then 5.10.x. I made the switch from 14.2 (stable) so I
could take advantage of a new XFX Radeon RX 5700 XT THICC Ultra III GPU
via amdgpu and the new Ryzen 7 3800X and Ryzen 9 3900X with Gigabyte X570
motherboards. The performance and stability has been exceptional, and
getting better. There is a lot to like about Slackware, so give it a try.
There is a live version that tracks Current here:

https://docs.slackware.com/slackware:liveslak

This new Slackware release will make a fabulous long term support release.
Remember: *ALL* Slackware stable releases are LTS!