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Do you want 15rds of 9mm in a sig p228 sized gun or 10 rds of 45 in a 1911 sized gun?
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I own a P30LS and a HK45.
The HK45 has the USP trigger system. I feel the trigger is a little crisper and the reset is a little shorter then the P30 trigger. The safety on the DA/SA HK45s is also the decocker. It's relatively easy to convert a DA/SA HK45 to LEM (or vice versa). You can replace the back strap to adjust the size and shape of the grip.
The P30 shares the same trigger system as the P2000. It's not as horrible as a lot of people claim. It's perfectly serviceable, but I don't think it's as nice as the HK45/USP trigger system. The decocker on the DA/SA P30 is on the back of the slide next to the hammer. The grip on the P30 has a replaceable back strap and side panels.
If choosing between the two I would answer the following questions:
Do I want a 9mm or .45?
Do I want a (slightly) better trigger or (slightly) better ergonomics?
Why am I not buying both?