Royal Continental if the seafront and seasonal pool are non-negotiable; Relais Della Porta if you want Via Toledo, higher room and supplier scores, and private parking without paying for the Bay — accepting the mold-in-shower cleanliness caveat either way on honesty, not as a tie.
Position decides most trips. Royal Continental has the only POI distances in this pair: Castel dell’Ovo 0.4 km, Piazza del Plebiscito 1 km, Vesuvius 12 km, Pompeii 23 km. Relais Della Porta has no POI rows — we judge it on Via Toledo and a 9.25 out of 10 location score, not invented walks. Location favours the seafront on the number (9.75 against 9.25) and on measured landmarks.
Guest scores favour Relais on the headline and the rooms: supplier rating 9.1 out of 10 from 3,948 reviews against 8.4 from 5,524 at the Royal, captured 12 December 2025 and 7 January 2026 respectively. Room quality is 9.2 against 7.7; cleanliness 8.24 against 7.74 — Relais still mentions mold in the shower, so neither is a spotless story. Value is 8.69 against 7.19.
Facilities split cleanly. Royal lists fitness, a seasonal rooftop pool (June–September, two-hour daily cap, booking required), restaurant, bar, pets and private parking. Relais lists family rooms, parking, private parking and an airport shuttle — no pool in the facts we cite. Service is stronger at Relais (9.71 against 9.21).
Check-in edges to Relais: from 02:30 PM until midnight against Royal’s 03:00 PM with no published latest arrival. Check-out is 11:00 AM at both. Relais has no airport_code in the property’s records; Royal lists NAP.