What game is easier (for beginner)

I bought SF6 at the same time as I downloaded 2xko and I want to go to the easier game. Wich in your opinion is the most beginner's friendly ? I don't know the lore of SF6 and knows alot about LoL lore so graphicaly i'd like to go to 2xko but I don't know if it's a good first versus fighting game. Any recommendation ?