definitely the 42, it looks like you have a wide wrist (which is good for a guy). You could probably even pull off a bigger size than 42 if Apple made it.
You on the smaller wrist size, but go with the 42mm.
The only time I would suggest a 38 for a man, was if that man is extremely tiny and frail.
You could pull off either one. I like the look of the 38mm more, but it just comes down to personal preference when your wrist is that size.
Thanks for the feedback guys! I think I will keep the 42mm then!