I am really curious about Resolve 15 as an editor because until version 14 included, I never experienced smooth playback out of the box with Resolve. As a color correction software this is not really an issue, but as an editor, it surely is.
Moreover, even though appealing, Fairlight was not yet user friendly enough IMHO.
Still, FCPX's asset management is light-years ahead than any other NLE and that's what make me use it as my tool of choice.
Below is copied from the Resolve Forum - go figure
Minimum system requirements
• macOS 10.12.6 Sierra - Windows 10 Creators Edition - CentOS 7.3
• 16 GB of system memory is recommended and 32 GB is recommended minimum when using Fusion
Please see the readme for your OS for further details
Latest Resolve also wants 4GB vram on the video card.
I think integrating Fusion and Fairlight has tightened the ram and processor requirements, however, Resolve is written to utilize eGPUs very well, providing you are willing to invest $$$$ for an enclosure and GPU and have TB3.