Format of future artworks? (Patreon)

Hi all! A bit of a more technical question than usual here, but I've been wondering if I should change the format of my artwork. 

Currently, I draw on default on a A4 canvas, which is the common "printer paper" size in my country, and only make it wider if for some reason the art doesn't fit in the canvas (like, looong dragons :3 ). 

To work, I still use a Wacom Cintiq from over 10 years ago which has a rather "square" screen which is not very different to A4, but I realize most people nowadays have wider proportioned screens... so I'm thinking about switching to a more panoramic size, like 16:9, which displays better on modern screens. 

What do you all think? What format do you prefer?

See this comparison to better visualize it: