Casio G-Shock GA-2100 (CasiOak) vs Casio G-Shock GM-2100

Both are the same watch underneath: the GA-2100 and GM-2100 share the octagonal case, Carbon Core Guard, 200 m water resistance, analog-digital display and 11.8 mm thickness. The GM-2100 adds a stainless steel bezel and Neobrite lume, which makes it look dressier and easier to read at night. The GA-2100 is the lighter, all-resin, more understated version that owners praise for fitting under a cuff and disappearing on the wrist. Buy the GA-2100 for a tough daily beater; step up to the GM-2100 if you want metal on the bezel and a sharper look.

• Choose the GA-2100 if you want the lightest, most low-key version for everyday wear and don't need metal trim.
• Choose the GM-2100 if you want the same watch with a stainless steel bezel and brighter night visibility.