So my friend and I are wanting to start speedrunning, and figured that duos would be a fun category to run. The big things I want to know are:

1. How do you reset worlds to be able to have both players join, as making a bunch of mineplex worlds or something is...less than ideal. I saw players like cube1330x just go into a server, but I don't know how to access that.
2. Is there an ideal version? I believe drop rates were lowered in 1.17+, but are there any other significant differences between 1.16 and 1.17+?