@Iguana7
"I think I go to my MBP 14 and change it by a 16 on which I will not add an external screen"
I was on an MBP 16 "so far, and I fell for the M1MAX in 14 ''
I will be frank, in terms of workspace, the difference between the 14 '' and the 16 '' is minimal, in portable use I do not feel it (under Photoshop, After Effect, etc.)
It's not 2 "more that will change much, let's be serious
On the other hand, most of the time I work on my desk, on a 27 ''.If there is a notable difference, you have to look for it between the 27 '' monitor and the laptop screen.There you have a difference.When you disconnect the MacBook Pro to use it in laptop mode, the loss of workspace is glaring
In short, I am not sure that you make the smartest choice