I've got the P30L and the VP9. They both are great firearms however the P30 does feel likes its better quality but I really believe any HK product is built better than most other brand firearms on the market. Don't think you can go wrong either way. Its just your preference from sticker fired vs hammer fired.
I have both as well and have to concur the P30L seems to feel more solid in hand.
Also, I find the p30l grip fits my hand slightly better even after adjusting both with the panels and back strap