
I would stay on 10.13 until at least another point release or two, I personally did not see any drastic improvement in performance going from 10.13 to 10.14. EGPU support is improved for output to the laptop screen (gaming only really) but that's all I really see as an improvement there and it does not affect resolve.
I am running 15.1 on a Mojave macbookpro without issues but I do not use it in production so no real world experience to speak of.
Good luck!