Honestly the USP Tactical is a much better choice if you're looking at HK45 or the P30. The VP9/SFP9 is great though
Although the slide stop and mag release are better on the newer pistols because they are larger and easier to use, I don't have large hands but I still prefer the USP any day. The new grips are nice but not a game changer, not a big fan of those finger grooves. If it doesn't fit you perfectly and you squeeze really hard, I feel you'd have less grip than a pistol without grooves. You can get extended mag release on the USP, slide stop isn't that big of a deal because you can release the slide with your reloading hand after the mag is inserted.
The recoil assembly is better on the USP as well as the match trigger. The match trigger is 100% worth it you will not regret it.
All I did was get the tactical in 9mm, ordered the thread protector and got Meprolight suppressor height tritium night sights (This is what HK uses and recommends). Want to get a Tactical in 45 soon.
Less recoil, better trigger and the pistol has a great history to it.
VP9/SFP9 is great though