Tbf, you can say that it's best to avoid Ligue 1 for centre halves but it's just as likely we could sign somebody already playing in England who would be a complete dud for us, or somebody from Spain or Italy. I don't think there is much continuity or correlation with the success of players coming from each league, it nearly always depends on the individual and how suited they are in terms of age, ability, style of play, mentality etc.