With worktrees you can have different branches in different working directories and work on them at the same time. But practically, there is very little difference to just cloning the repo twice and working on different branches in the two checkouts.

With clones you have to fetch everything N times. You have to gc everything N times. You have to do `git config --local` N times if the config matters/affects all clones. If you need a local branch in two clones you need to synch. between them. The repository needs to be managed, which means that every clone needs to be managed. With a worktree there is nothing extra to manage.

And when you’re done you remove it via the subcommand and it’s gone.