The P30’s ergonomics are superior. That said, the Glock’s are very easy to adapt to, and with the shorter butt heel (compared to the G17) it’s not that difficult of a struggle at all.
In a part-for-part comparison, I don’t think that there’s any doubt that the HK is of superior materials and manufacture; however, in the real world, that has actually provided to be of little, if any demonstrable difference/advantage.
While I’m not happy at all over the seemingly ongoing issues with late Gen 3 and Gen4 Glock extractor issues, and Gen4 recoil spring (finally resolved) and ejector issues, Glock does seem to be stepping up to the plate to resolve the problematic guns. HK’s aftermarket support is legendary in its contempt for consumers, seemingly of the attitude that superior German engineering trumps any real-world vicissitudes…
Glocks are probably the easiest guns in the world not just to field-strip, but to detail strip-and reassemble. To detail-strip an HK seemingly requires 3 hands, an engineering degree, and specialized tools.
Additional Glock magazines are inexpensive and readily available; conversely, additional HK magazines are expensive and sometimes appear to be made of unobtanium.
Glock triggerpulls are usually fairly nice right out of the box, and easily reconfigurable with easily available and inexpensive varieties of connectors and springs; every time I’ve come close to acquiring an HK, I’ve been off-put by their triggers, especially the DA, which inevitably seem to be significantly heavier and grittier. Of course, you can subject the gun to the ministrations of either HK or a number of aftermarket gunsmiths, but this seems to be an inordinate requirement for an already significantly expensive gun; Glocks can be had for literally half of the price of a comparable HK.
While I doubt that you’d regret getting a P30, and it’s ergos are very nice (especially given its swappable side panels and backstraps, particularly nice not just to configure to yourself, but nice if you’re going to be sharing it with a significant other), I think that the Glock provides a superior value, and you can utilize your cost savings in training, practice, and competition so that you can truly utilize the gun to its (and your) best advantage.
Best, Jon