Glycine Combat Sub Automatic Watch vs Glycine Combat Sub 39

Both are Swiss automatic dive watches from Glycine with the same GL224 movement family, so the real choice is size and water resistance. The Combat Sub 39 is the better all-rounder: a 39mm case, 11.2mm thickness and 300m rating make it easier to wear and tougher in water. The Combat Sub 42 offers a larger 42mm case and a rubber strap, but its 200m rating and reports of a stiff strap and one early failure make it the riskier pick. Buy the 39 unless you have a large wrist and want the 42mm look.

• Choose the Combat Sub 42 if you have a wrist of about 7.5 inches or more and prefer a bigger, bolder dive watch on a rubber strap.
• Choose the Combat Sub 39 if you want a slimmer, more versatile dive watch with higher water resistance that fits most wrists.