It seems like a lot of people are struggling with these questions. I'd argue that the previous-generation 13" MBP, even in its M1 variation was a portability-optimized computer with very modest 'pro' capabilities, where the 16" MBP was on the line between a highly portable large laptop and a fairly modestly capable desktop-replacement.
The new 14/16 MBP's lean much more heavily into desktop-replacement category, and you're just choosing the screen size and chunky-ness. If mobility is your main concern, then the 13" M1 MBP or MacBook Air provide outstanding capability in a very thin/light package.
I'm typing this on an M1 13" MBP, and my 16" M1 Pro MBP arrives tomorrow - it lives on my desk connected to the 27" LG 5K monitor about 90% of the time, I only bring it places when I'm actually doing real work, rather than just office and web stuff.