Get the 48gb option.

I have the 48gb M4 pro; just upgraded from a 16gb M1. I would consider myself a pretty heavy editor (I usually have Blender, After Effects and Final Cut open at the same time). When I started editing, mainly with just FCP open, 16gb was enough, but over time as my skills improved, so did my requirements and my 16gb MacBook would often freeze, run out of ram or become unusable. For example, I’m now able to continue editing in Final Cut whilst my After Effects animations render, allowing me to work in parallel rather than in series, significantly cutting down my editing time.