Is the mobile data better than the Wi-Fi at my resort (Mambo Beach / Jan Thiel)?

Yes, for privacy and mobility. While resorts at Mambo Beach or Jan Thiel offer free Wi-Fi, it is often slow, shared with hundreds of guests, and only works in the lobby. A personal eSIM gives you a private, high-speed connection that works everywhere, in your room, by the pool, and, most importantly, when you leave the resort to explore the rest of this beautiful island.