In test mode nvidia-inst shows the recommended commands for your Nvidia GPU.
You currently have packages nvidia and nvidia-lts installed.
However, Nvidia’s recommendation is to install nvidia-open (and nvidia-open-lts since you have linux-lts too) instead.
Additionally, since you didn’t use option --no-dkms, nvidia-inst would install nvidia-open-dkms and related dkms package.
Hope this clarifies the output.
Anyway, if your system is working well, there’s no real reason to change driver packages for now. But it is impossible to tell what happens with Nvidia’s driver packages in the future.