I'd say the 16, but with a caveat. By itself it is a great machine. In clamshell mode with an external 4k screen it is a great machine. With the laptop screen open connected to an external 4k screen it is EXTREMELY noisy and hot.
~173 pages of complaints on Macrumors here: https://forums.macrumors.com/threads/16-is-hot-noisy-with-an...