If you still are watching this and care....
Personally, I have evaluated Patrol. It proved to be quite obviously ported from Unix. Everything worked great, but much of the configuration was done by editing files, and the UI was cumbersome (in my opinion). I've looked at AppManager a bit less, but it appeared to be as capable as Patrol while feeling more in line with the rest of NT, particularly in the UI and configuration. If you need to monitor more than just NT, Patrol is probably better, if you want to integrate that monitoring. If you only have to monitor NT, I'd guess AppManager will be easier to work with, and give you the same results.