I agree that. So I guess the question is who suits us best. Or more precicely, who suits Maguire and how we want to play.
I'm not going to pretend to be an expert. In my opinion, you need to see a lot of games from a centerback to really know them well. For a good CB, it is not just about what they do, but what they dont do (or very rarely do). Quite a few would be very excited about Bailly if they saw him in three games and were lucky with the games they saw.
I also think people put too much weight on numbers and apperance (what is easy to measure and see). For instance, people dont like Pau Torres and claim that he is a copy of Lindelof. Based on what? Both being passive defenders? So is Varane! He obviously look a bit similar to Lindelof. Does that affect peoples judgement? I suspect it does. In my opinion, Pau Torres have some traits that could make him a good fit for us. Left foot, quick and very "agile". Furthermore, he looks to be to be great on the ball (alot better than Varane). A similar case is Kounde, who is labeled "too short" (despite "never" having issues in the air).
In my opinion, all three CBs that I have mentioned in this post would be very good additions and probably CBs that would suit us very well. I must admit, that I would have to see a lot more from both Torres and Kounde to be able to say who would be the best CB for us and whether they would be better than Varane. Varanes merits speaks volume. But one should be vary that merits could be noise and misleading.