As I hear the Minnesota a lot, while it is a very good band,perhaps with its Finnish Conductor the best Sibelius one in US, it would be giving them the benefit of the doubt to place them in the top 10 much less the top 5 .
Of course any orchestra in top 20 is very good and MN is certainly there.
From what I hear on NPR , LA is not all that consistent but
not hearing them live , that's just a guess.
One thing I hear about the Pittsburg that is not a guess is that their woodwind section is as good as it gets.