Death Billiards

Both about games of survival Both have protagonists "spawn" in a random location Both are gritty and dark 

The most similar aspect of both anime is how they put a spin on classical games and warps them into a psychological thriller. What is perhaps more important is that these main players learned more about themselves and comments on social themes such as inequality, injustice, and consequences of interactions. However, Kaiji goes a little overboard in terms of gambling and risk-taking while Death Billiards seem to have a supernatural element to it. Regardless, highly recommended if you liked the other. 

both are afterlife themed stories based around the concept of judgement. 

Death Billiards is basically a movie of Death Parade So if you want to start the death Parade series you can still watch it before the series. It is a short movie more like a episode. 

Artiswitch is like Death Parade (which also has a movie named 'Death Billiards' that came before it) and Paradise Kiss had a baby. It has the 'finding yourself' narrative & fashion aspects of Paradise Kiss, but the 'mysterious unknown location' & helping/analyzing people parts of Death Parade. I highly recommend all 3 if you're a fan of Artiswitch.