Is this eSIM cheaper than my resort's Wi-Fi (e.g., in Denarau)?

Absolutely. Most luxury resorts in Fiji (especially in Denarau, Mamanuca, and Yasawa) charge very high fees for Wi-Fi (e.g., $20-30 FJD per day), and it's often slow or only works in the lobby. A Cellesim eSIM gives you a private, high-speed 4G connection for a fraction of the cost, which works everywhere, in your room, by the pool, and on the beach.