Holdem Manager 2 itself will help you a lot with TRACKING but if you want further help tools, first buy the manager 2 but there are add-ons that themselves require further purchasing, one is for sit-n-go training, one for cash game detailed automatic reading of players in game etc.
I prefer HM to PT because it is much more user-friendly and the graphs are much prettier (yes literally the graph prettiness is a reason I chose it).
Note: PokerStars has confidentiality that other sites don't which means that unlike on 888 and partypoker, you have to opt-in to have public see your hand history and efficiency at earning, the pro of this is no one can really mock you as they can't see anything until you opt-in. The down-side is the software only reads opponents based on games you physically observe with them in (including ones you spectate which can be helpful).