Hey Akatosh,
Thanks for the short anwser. In this case I will install the 2.1 Version. Is there is reason, why i should choose SSE over the normal Legendary Skzrim Version?
I will use Perkus Maximus, not sure if it is working with SSE.
What Shadriss said. Also there are already major mods who's mod authors are no longer supporting LE versions of there mods. RWT and Unofficial Patches come to mind.
Perkus on SSE: https://www.nexusmod...tion/mods/11044
Search is your friend.