The other versions all have use cases other than avoiding collisions. If your access patterns are such that you often access ids generated around the same time

The other versions all have use cases other than avoiding collisions. If your access patterns are such that you often access ids generated around the same time together v6-8 will probably be faster due to locality. If you access data generated on the same node together, than same for v1-2. If you want a reproducible id based on some other identifier, then only v3 and v5 will work.