As these boats age, basic construction is very important
. (Not deriding "frills" and add-on's, 'cause I like that stuff too...)
The C&C will have the best hull-to-deck joint by a country mile, and the Newport the worst. This is a big deal as boats age and hard-to-fix leaks start cropping up in many boats.
Sailing ability is another thing. You will find that something like PHRF is handy for a quick one-dimensional potential speed-under-sail comparison. Problem is that it can not tell which designs are actually fun
to sail and will be easy
to make go fast.
I believe that the C&C would be #1, the Morgan a somewhat distant #2, and the Newport would be further back yet.
Given that you will be smart enough to find a design whose compromises are a great fit for your sailing area, you will like whatever you buy.