I don't have the Sig but do have the HK P30. I have shot the Sig P320. I would say these two are about the closest you can come to being equally fantastic pistols.

I would say sig its more common and if you ever need to sell it would have a better used value

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I've shot them and neither can compare to the CZ P10.
budsgunshop.com/catalog/product_info.php/products_id/411557766/CZ+P-10+CMPCT+9MM+BLK%2FBLK+15%2B1+4.02in

I guess it depends on whether or not you want a DA/SA pistol or a striker fired pistol. I'm not sure if you're confusing the P30 with the VP9, whic is H&K's striker fired model. I like the modular design of the 320, but I like the ergonomics and adaptability of the P30 and VP9 more. That said, I don't own either, but I'd prefer the VP9 SK over the 320, simply based on feel in my hand.

I would say sig its more common and if you ever need to sell it would have a better used value

I love my Sig320 So much I've been debating on getting another. Nothing shoots like a sig. Only other I'd look into is a FN five seven.