Casio Wave Ceptor Solar Analog Watch vs Casio WVAM640D-1A

Both are Casio solar Wave Ceptor watches with radio-controlled timekeeping, so the real decision is analog versus ana-digi and 50m versus 100m. The WVA-M630D is a clean analog three-hander with a stainless steel case and bracelet, suited to someone who wants a simple solar watch that never needs a battery. The WVAM640D-1A adds a digital display, 100m water resistance and a mineral crystal, and its 4.7-out-of-5 owner rating from 70 ratings suggests buyers are satisfied. Pick the M640D if you swim or want digital readouts; pick the M630D if you want a plain analog face.

• Choose the Wave Ceptor WVA-M630D if you want a straightforward analog solar watch with a stainless steel bracelet and only need splash and rain resistance.
• Choose the WVAM640D-1A if you want an ana-digi face, 100m water resistance for swimming, and a mineral crystal over the dial.