Yes, ChrisH and Mike. I totally agree with your views. I am "lucky" to have limited space for the mill in my shop so that's my hard constrain. Anything bigger than the WM14 is not an option (unless I could keep the table size of the WM14, if that's even possible).
I've contacted Warco sales dept to know more about the geometry differences between the 12 and the 14: the column section of the WM14 is 100x80mm and box section, while the column on the WM12 is 100x50mm and "scalloped at the back" (not sure what "scalloped" means in this context, perhaps C-section?). So, I think it is safe to assume that the WM14 is much stiffer than the WM12, with that beefier column.
All things considered, I would probably pick up a WM14, if it wasn't for the fact that it's out-of-stock until March 2021 :/ Thanks, Covid? As I am not in a hurry, I will wait and see…
Thanks again for your wise inputs. Much appreciated!
Jose