Miami is a trade city before it is a retail city. The warehouse belt through Doral, Medley and Hialeah exists to consolidate, re-export and distribute goods across Latin America and the Caribbean, and a large share of South Florida's online sellers grew out of that trade rather than out of a consumer brand. Their customer might be a distributor in Bogota, a salon owner in San Juan, or a shopper in Coral Gables, and the same catalog has to serve all three.
That produces a set of requirements almost no other US market imposes at this frequency. Sites need genuine Spanish content rather than machine translation with hreflang tacked on top, and often Portuguese as well. They need landed cost, duty and incoterms explained on indexable pages, because an international buyer abandons a cart over an unexplained charge more readily than over a price. And they need currency and destination logic that does not fragment the same product into a dozen competing URLs.
The consumer categories that thrive here are just as particular. Marine and boating supply runs year round on the coast, aesthetics and personal care are unusually strong, and luxury resale of watches, handbags and jewelry has real depth, which brings authentication and provenance to the center of both ranking and conversion.
Seasonality is also inverted relative to most of the country: hurricane preparation, year-round outdoor demand and a winter population swing all move search volume on a calendar national competitors plan badly for.