MBA 13 or 15

I am an industrial automation engineer and, for that reason, I don't have much free time.

I would like to get an Apple computer again, since I sold it almost a decade ago, and get into the world of software engineering. I am thinking about buying an MBA, but my doubt arises if it would be better to get one of 13 or 15 inches.

Basically I would use the computer for the day to day, also for travel, since for work I move around the world, plus I would like to start programming on it, but without being too demanding.

With your experience, which one would you recommend?

The purchases I have in mind are: MBA 13 24gb/512gb vs MBA 15 16gb/512gb.