The EU may have local subtitles - running all at once
(joking)
Well - there were games where I would never go for EU / UK version (like Fallout 2) due many many "restrictions" that nearly "kill" the game.
For KB tL I can't imagine that the children protecting law could "damage" the game experience, as there was no faul language nor something "bad".
So it looks like the choice is free of gameplay restrictions.
In EU you would have more manuals (in each Language one) and you can use them to improve you language skills