imo Holdem Manager is better than Poker Tracker 3 due to the fact that the pop up menu gives you positional information (VPIP & PFR per position), PT3 doesn't. Also, the replayer in HEM displays the stats whereas in PT3 they don't display stats, minor but annoying when doing session reviews.

Both have built in hud displays so you don't have to use a third party.

You should be able to demo both and see what one you like better