Cannes has the festival, the Croisette and the Palais. Marbella has the Golden Mile, Sierra Blanca and 70+ golf courses. Both compete for HNW European buyers who want a Mediterranean residence with year-round usability. Cannes carries the prestige of pre-1939 European leisure, the May film festival, MIPIM and the wider Cannes-Antibes business calendar. Marbella carries Andalusia's 100% wealth-tax relief — limited above €3,000,000 of net wealth by the state solidarity tax — and the Beckham regime for those who move to Spain for work.
This piece runs the comparison honestly. Cannes is more reasonable than Cap Ferrat or Cap d'Antibes on €/m² (because Cannes is a real city, not a trophy peninsula), but the French tax stack hits Cannes the same as it hits the rest of the Riviera. The headline needs care: once Spain's solidarity tax on large fortunes is counted, a €10M Cannes Croisette apartment and the equivalent €10M Marbella allocation carry annual wealth-tax bills of the same order.
A €10M Cannes Croisette apartment held by a French tax resident attracts roughly €100,000–€135,000/year IFI, plus taxe foncière €15,000–€30,000, plus second-home taxe d'habitation surcharge (Cannes is a tense-zone commune) €8,000–€20,000. Total annual property-tax burden: €123,000–€185,000.
Same €10M apartment on Marbella's Golden Mile, held as net Spanish assets with no debt: €10,000,000 − €700,000 = €9,300,000, which on the solidarity-tax scale gives €39,915.97 + 2.1% × (€9,300,000 − €5,347,998.03) = about €122,900 a year (Article 3 of Ley 38/2022). IBI is the cadastral value multiplied by the municipal rate — the amount is on the last receipt — and a non-resident who does not let also pays tax on a deemed income.
The annual difference depends on debt, ownership structure and residence; it is not a fixed sum in either city's favour.
Cannes wins on May festival calendar density, French art-de-vivre, easier direct European HNW connectivity from Nice airport, and pre-1939 architectural patina. Marbella wins on plot generosity, golf density and resale liquidity.
France publishes its completions through the Notaires de France statistics; Spain publishes none at property level. The Marbella side is therefore asking prices from our own register, and we will not present the two as one series.
On the same budget, the Croisette offers a sea-view apartment, often in an older building requiring further capex, where Marbella's Golden Mile offers a larger apartment or duplex with terrace and pool access; Super Cannes offers a villa on a modest plot where Nueva Andalucía offers a larger one. Current asking prices by zone, each with its sample size and date, are on the Marbella Property Index (museselection.es/marbella-property-index).