Single provider API
A direct integration with one provider gives you the deepest access to that provider's features and roadmap — and a fixed cost in engineering, certification and maintenance for every provider you add.
Multi-provider API
A multi-provider API (aggregation) gives you breadth: many studios through one integration, one wallet interface and one catalog. The trade-off is a layer between you and each provider's newest features.
The hybrid reality
Most mature operators do both: aggregate the long tail of content, and keep direct integrations for a few strategic providers where deep feature access matters. Plan your wallet architecture so both models coexist.