The most important thing to consider is how big the watch case is in relation to your wrist. Watch case dimensions are stated on all product pages (36-44mm)

We must also clarify that it is subjective how you like the watch to sit on your wrist, but here is a general recommendation for our models:

Small wrist (36-40mm) : Datejust 36 & 39mm, President, Santos, Yacht Master, Wolf of Wall Street, Daytona, GMT Master

Medium wrists (40-41mm): Datejust 39mm, President, Santos, Yacht Master, Wolf of Wall Street, Daytona, GMT Master, Royal Oak, Nautilus and Aquanaut.

Large wrist (41-44mm): Royal Oak, Nautilus, Aquanaut, Sea Dweller and Big Bang.

The strap/link on all models can be adjusted to fit your arm. You can either do the adjustment yourself with a small screwdriver (on many models) or get help from a watch store.