It's an interesting time to choose a processor in 2019. AMD has made huge advances in the last few years, and they've finally pushed Intel to advance their own technologies in order to compete.
I don't know if Cubase has any dependencies upon specific Intel architecture, so my perspective is kind of an outsider's point of view.
I think that with this summer's release of the 3rd generation Ryzen chips, it's a hands-down win for AMD. They offer higher core count at (finally) competitive per-core clock speeds, all at a lower cost than Intel. The Zen 3 architecture is really promising.
I'm still using a 1st gen Ryzen 7 for an audio/video workstation and I really love it. I'm probably going to jump on the 3rd gen bandwagon once they're released this summer.