HEM2 and PT4 are both identical for like 90% of the players, all those players do is just look at their stats, look at their graph, they need HUD and a way to replay their hands and that's pretty much it. Both programs do that great. If you wanna go more advanced then you just have to dive in and test both programs to the fullest, because most features many players don't even know exist so how can they make a decision, don't choose because some fanboy said one is better than the other, also people are stupid that they don't know how something works and they will just yell it's broken and shit. HEM2 has 30 day trial, PT4 now is in beta(it is beta, but it runs great) and it should be released in upcoming months so until then you can use it for free.
Yes, both do Zoom. About note tracking, I know HEM2 has Note caddy, it has some built in features, but you can also buy it, not sure how they work, haven't tested them, PT4 has Note Tracker which takes automatic notes similar to Note caddy. Not sure about those notes because I haven't really messed around with them.
There are a few Youtube videos that go over both programs, by watching those you can find out about features you might not find when using the program.
Here is one about PT4
and about HEM2
If you don't want to watch those long videos then there are shorter ones that show just the available features.