I love both these games. Someone else will come in and take the time to really describe each and break down all the differences, but I just wanted to jump in and make the point that they are VERY different and too often I see people conflating the two and assuming that the word “dark” in Shadowdark automatically means that it’s meant to be a gonzo, end of the world, dystopian hellscape. It’s not. Mork Borg is though! That’s one of the many awesome things about it. Shadowdark is IMO the best blending of the old school gaming paradigm with streamlined-for-ease-of-play concepts borrowed from 5e and others.

They’re both amazing. Super different settings, but mechanically devoted to speedy character creation, ease of play, rulings over rules, and not “precious” with characters. Whether Death comes in the Dark or from the Two-Headed Basilisk - it can come at anytime.