38mm doesn't get much love.
Find it kind of odd. Since it's cheaper of the two to buy. I don't the battery life is not that much of a difference compared to the 42mm.
But then pressing your targets on that screen be of concern. I never actually tried out the 38mm.
I started out with a 38MM for my first AW. It was a 38MM SS Milanese. I went through a few trying to find the right band, then realized that I liked the 42MM better because the screen was larger.
I didn't really have that huge a problem pressing my targets, but I have small hands.
I do like that the 38MM isn't quite so large on my arm. Looks a bit more like a fashion piece on my wee, girly arms.
I'll open this one here in a bit and give it a look. I've never had battery issues with my 42MM and of the 4 AW wearers in this house, 2 of them are 38MM AW wearers who don't have battery issues, and this new series has a better battery life, so we shall see.
I do think that the down side would be that I have a ton of bands for my 42MM, so a 42MM would be best from the interchangeability perspective.