This seems like a topic where no-one can even agree on what they're comparing. Is it the overall wealth of the league? Is it the European performances of its teams? If so, over this season, or over several seasons? Is it a general sense of footballing ability, not measure by European performance? Is it comparing the on-paper footballing strength of sides? Are people comparing Man City and Real Madrid, Brighton and Osasuna, or Sheff Utd and Almeria? Is a league stronger if it's more even, or weaker?
What's any of this *for*, really?