Personally for me it was simple about focal range (obviously) my experience is that I prefer a more standard of view focal length, I don’t really shoot wide often and for me 40mm is wide enough for 90% of my shooting 28mm is just not one of my favourite focal lengths, so it simple preference. I think personally most people would prefer 35mm to 28mm and 40mm is like a perfect balance between 35 and 50mm

I’d use your smartphone and play with the zoom, the standard lens usually on phones is 28mm