You are making a good point that proves mine ha 16’s are likely easier because to get to 16s you need to be top 1-2%. Your pool of players is higher quality.
13’s is full of people (in the 26%-33% range) who got a 2 chested 11 or 3 chested 10 because they invited someone with 3k to 3300 IO for their vault/crest farm key. I did a 3 chest EDA on my DK last week the guy who had the key was sub 2500 IO, now all the sudden he has a 13 Halls or whatever it turned into, he is going to list that key not interrupt the hound master and wipe on the first pull.