The title of the post seems to be if it is better to work for YU or for a Mir Bochur.
I don’t know the financial stability of the Mir Bochur, however it is well known that YU is in dire financial straits, having lost hundreds of millions of dollars in past few years.
A position there may not have longevity, certainly because you wouldn’t have seniority and likely would be one of the first to be let go when they need to cut costs to stay aloft.