Audemars Piguet Royal Oak 15500STvsRolex Day-Date 40

Both are excellent watches with different strengths. The Audemars Piguet Royal Oak 15500ST offers a larger case and costs less new. The Rolex Day-Date 40 excels in water resistance. The best choice depends on your wrist size, budget, and preferred aesthetic.

The Audemars Piguet Royal Oak 15500ST retails for $24k–$26k, while the Rolex Day-Date 40 is priced at $38k–$45k. Pre-owned, expect $35k–$50k and $35k–$55k respectively. Actual secondary market prices vary based on condition and demand.

The Audemars Piguet Royal Oak 15500ST has a 41mm case diameter with 10.4mm thickness, while the Rolex Day-Date 40 measures 40mm × 12.4mm. Both have lug-to-lug measurements of 48mm and 47mm respectively. Consider your wrist size and wear style when deciding.

The Audemars Piguet Royal Oak 15500ST is water-resistant to 50m, while the Rolex Day-Date 40 offers 100m. Both are suitable for swimming and snorkeling at their respective depths. For professional diving, verify the rating exceeds 300m and includes a screw-down crown.

The Audemars Piguet Royal Oak 15500ST uses a automatic Cal. 4302 with 60 hours power reserve. The Rolex Day-Date 40 features a automatic Cal. 3255 with 70 hours power reserve. Both offer traditional mechanical craftsmanship.

Audemars Piguet and Rolex both command strong secondary markets. Pre-owned pricing shows an estimated resale value of $35k–$50k for the Royal Oak 15500ST and $35k–$55k for the Day-Date 40. Condition, service history, and box/papers significantly impact resale value for both models.