both are good spec, we could provide much insight if you told us what other components that you already have or plan to buy.
About power related component, its like fruit, although comes from a same tree doesn't make make one fruit taste as equally ripe as the another, motherboards components that being said although use similar VRM + chokes + mosfet + other related were design differently, if you use Ryzen 1700 (not the 1700X) either boards is decent pair.
At POST RAM will run as JEDEC spec and at first use you should update its BIOS, in my experience high speed not always equal higher fps (gaming) faster render time (CAD render) the F4-3200C16D-16GTZKW will likely gets up to DDR 3600 with CL18 or DDR 4000 with CL 19 (adjust voltage ), you need to play with multiple setting to get your best whole system speed up.
I recommend 2700X over 2700, out of box higher performance without having to manually OC 2700 on Gigabyte X370 K6, I've been using X99P-SLI over half decade with 780Ti and now 1080Ti, never had MSI before, but recent UEFI BIOS menu usually easy to play and save.