If Debian Stable supports your hardware, go for it. If not, try Debian Sid, but it won’t be as stable. You can install up-to-date applications, like Steam, using flatpaks in any case.
Even if you opt for stable and there’s an update that you may take advantage from, you can always update your kernel in several ways or change to Debian Sid (unstable), but you can’t go back unless you change to Debian Testing and then wait the freeze of Testing which then becomes Debian Stable.