SMS is incredibly antiquated as soon as you want to do anything multimedia, or heck sending an SMS longer than 144 characters.

My mother received a video over SMS the other day and it legitimately looked like it was filmed on a Nokia 6310.

I’ve encouraged my family to use Signal to replace SMS and it functions really well as an SMS upgrade. It’s more secure, private, supports sending decent quality multimedia, the interface is simplistic, it has formatting, does video calls well.

From both a security and usability perspective, it wins out on SMS in my opinion.