I have a small wrist and have always worn huge watches, so size does not intimidate me. Having said that, I started w/ 38 on Milanese loop - didn't consider the larger one. A colleague showed up wearing the 42 - tried that one alongside mine and reconsidered. Although I liked look of the 38, after a week of squinting at it, I went back for fitting w/ 42s.
I discovered that the band makes a huge difference. 42 on Milanese loop looked goofy- and the loop for the larger watch was too long. My wrist is 152mm (exactly six inches): the Milanese loop says it fits from 150mm, but magnet doubled back to hit the watch case vs the band. Link bracelet= more adjustable, but also a bit clown-like. Black classic buckle was magic - enough to make the swap.
the look and fit changed dramatically from one band to another - in part because of how the different bands attach to the watch. Integrated (link; sport) had a larger look vs the others (leather, Milanese) that integrate metal loop rather than the band itself. The watch that was too big on Milanese, too goofy on link, was perfect on classic buckle.
If you're on the fence, try all the bands you like enough to buy and wear- it does change the look enough to help with the decision. I've also stopped squinting
