When I started out with tracking software a few years ago I used PO.
I liked it, but eventually I have tried PT3 and HEM. I don't know which new features PO has these days, but in my opinion HEM is the best. It's a personal opinion, but I have tried all three. Also if you plan on playing any Omaha, HEM has that option to, both for Hi and Hi/Lo. HEM is VERY easy to use.
GL with your choice.