Yes, my son is a giant compared to me, so if he ever decides "watches", the 40mm will hold up more for him for sure.
The blue, to my eye, is a tad deeper.
TBD on the accuracy, I haven't paid too much attention since the purchase. I've only taken it off at night since Tuesday. A quick spot check shows it's running about 2-3 seconds slow compared to my Apple Watch since I set it. (noon Tuesday until 6:25am Thursday)
The boutique manager said I might be the first he's heard of to get the bracelet on the Petit Prince, but of course that doesn't make it true.