Yes, the HUD shows onscreen stats for all the players at the tables, and PT3 works on Red Kings.
While I might be biased, I personally prefer PT3 to HEM because of many different reasons. First of all, esthetically, I very much prefer the looks and the menus of PT3. Also, the tournament support in PT3 is way better than the tournament support in HEM and we have TableTracker (table selection tool). Our custom stats are incredibly powerful and you can make pretty much any kind of stat that you can think of. Also, PokerTracker as a company is bigger and more experienced, and we're currently looking to expand our development team. There are loads of other reasons as well, and we also offer a 60 day free trial with very few limitations (you're restricted to one database and you can't use TableTracker or custom stats) that I think you should try out and see what you think, just download it from our
Download Page.