The Z370 has neither VGA nor DisplayPort nor USB-C, but accepts 3 PCIe cards instead of only 2.

Otherwise it's little different from the H370.
USB-C isn't just "USB". It's more sophisticated, and includes DisplayPort functionality.
DisplayPort allows chaining multiple displays off the single port, as many as 8 I think. I find it more reliable than HDMI. I've had HDMI ports die five different times on three types of devices.
I used VGA on a display with both DVI and VGA for many years before I took the trouble to see what if any difference there was. Until doing a serious comparison, the difference might be of little or no notice. Now that I've done it, I'm disinclined to use my PCs that have only VGA. In a side by side comparison, the difference can be stunning, and now my eyes recognize the difference without a side by side. Gone is any need to adjust screen size or position, to use the full area without having any edges cut off.
VGA on new displays probably won't be around much longer, especially on the 2K and 4K models, where it's already scarce.