Between the two, MSI gaming plus wins.
Some reviews on ASUS:
Do NOT buy with a Ryzen chip
This review is from: ASUS PRIME B350-PLUS AM4 AMD B350 SATA 6Gb/s USB 3.1 USB 3.0 HDMI ATX Motherboards - AMD
Pros: - cheap
- lights look pretty
- taught me to avoid ASUS at all costs
Cons: I like many other people have been having a mountain of blue screens with many of them being inconsistent and difficult to pinpoint, after months of buying new parts and diagnosing, even memtest86 needs a workaround to run with this board and chip setup. The only common link I've found with the issues I've found between my issues and similar ones is that they're always using the Asus B350 and a Ryzen chip. I'd avoid at all costs until it gets fixed in a Bios update, or save yourself a tonne of time by just paying an extra $20 for a better board that functions out of the box