While most people definitely believe Paul Pollis killed his wife, there is a pretty good thread here casting some reasonable doubt on his guilt.
http://www.sitcomsonline.com/boards/...d.php?t=277571
Of course, I still remain convinced Paul is guilty, but upon a closer inspection, the idea of him being able to successfully get rid of his wife's body in such a limited timeframe (and doing it so well that it has remained undiscovered for over a decade) is not as plausible as it sounds, and I'm not as 100 % sure as I used to be. I can definitely understand why no one's ever tried to charge him without a body.
There is ZERO doubt, however, that Mark Nichols successfully got away with the murder of his wife and he may be the most lucky suspect ever featured on UM. If he had committed the crime a couple years later, I'm sure forensic technology would have advanced far enough that they could have built a case against him even without Christi's body.
If I had to score both men, I would give Mark Nichols a big fat ZERO in all categories (and would be compelled to give him a negative score for "convincing empathy"). Paul Pollis is a lot harder to rank, but I might at least give him between a 2 and a 4 in most categories.