Matthews, NC
You'll never find the "right answer" to this one. It's like Coke vs Pepsi, AMD vs Intel, Ford vs GM, etc. Lots of opinions, and the answer depends on what your opinion is/what you want.
My opinion is biased because I've worked on hundreds upon hundreds of Bally/Williams games including about 15 original MMs and have never had one that I could not keep it get going 100%. WPC95 especially is reliable and always repairable in the right hands. And yes the remake now has a higher resolution colorized display but an original has the Pinsound option for better audio and customization. I've been working on adding a lot of extra sounds to my MM (so I am super biased), replacing all of Earl of Ego's quotes and adding a lot more colorful speech.
Saint John, NB
