Marist is a much, much better poll than Quinnipiac.
They are both good pollsters. It's a matter of A- vs. A, which really isn't that different.
OH and IA are in the basic ballpark as other pollsters. There are issues with PA, obviously. One or both polls are outliers.
Considering the history of how PA votes compared to OH and FL it's pretty easy to see that Q is the outlier. PA is almost never more conservative than OH or FL in a general election. Clinton might not have a 9 point lead in PA but she leads with 95% confidence IMO and that poll is much closer to being right