It comes down to how much database analysis you want to perform.
If all you want is the HUD stats over-layed on the table during play then Drive Hud, Hold'Em Mgr and PT4 aren't that different. DriveHud's user experience is is modern and beautiful whereas the others are dated and old looking (they've been around a lot longer).
If you want to dig deep into how you play, to perform detailed analysis then you want Hold'Em Mgr or PT4.
Hope this helps!
mmm, well, that's not completely true. I mean Hm2 and PT4 have been around longer. If you have some advanced programming experience, and know poker databases really well, there's more you can do w/ Pt4 as it stands now. However, I don't think 99.6% of players use those features.
You can do pretty much the exact same analysis across all 3 platforms. Drivehud is optimized for the review process including automated hand range analysis and GTO style tools for free. Neither PT or HM have those.
There's going to be pros and cons for all software. I always recommend using the trials for all software, and seeing what makes the most sense for you.