Pros
Before the merger, I would have said adherence to Mission, Vision, and Values. Now, I don't know what to say, maybe that the company might be solvent after this is over?
Cons
The merger between Ministry, Columbia St. Mary's and Wheaton has led to arbitrary layoffs (on the order of "give me five names of people to fire by Friday") without any strategy or vision driving it. They are simply mass closures and reductions with little regard for the work people have done and sometimes with no notice, no severance, and people having to fight to get PTO paid out (which is illegal, but who's counting). The new company will be called Ascension Wisconsin, so I'd recommend avoiding them if you can for a couple of years until they figure out what they are doing. Right now you could be hired today and fired tomorrow.