Spending a number of years from age 19 in ligue 1 for a team that coasts games would be disastrous developmentally.
Taking off my united glasses I think that right now if I were de Ligt, I would rate potential offers as follows, based on those being linked
1.
Smart move- Barcelona. Great league, team mate going also, ageing defence that I could own for a decade, best player in world, good football culture, constant champions league and title challenges
2.
Perfect timing- Liverpool. Current European champions, club in a great place, manager secure and popular with great football. Best league in world to develop, more senior international team mate beside me, chance for long term club and Country partnership.
3.
The food for thought- Man United. Probably most ready to make me the leader, possibly captain in near future, part of a youthful rebuild? Incredible money not likely to be matched. If it goes well could be iconic player of biggest club in world.
I wouldnt even consider psg if I were him. City I'm not sure how strongly they're linked but likely guardiola leaving in 2-3 years max, possible champions league ban and playing for a club with pretty much no gravitas would put me off personally.