I've read that de Ligt wanted to play with Messi, but since Barcelona couldn't afford, he chose to go to Juventus so that he could play with Ronaldo instead.
I don't know how much truth there is to that statement; he apparently idolized Ronaldo since he was little.
I do believe Barcelona were his first choice though, probably because of the club's standing and playing style, and also for the huge pull they have on Dutchmen.