If you mean a sportsbook / prop-market engine (not just a data feed), the “best” choice depends on whether you want speed-to-launch, live stat grading, odds automation, or custom market flexibility. The top options people usually evaluate are:

Best overall if you want fast + flexible + live updates

Sportradar

• Strong coverage of major leagues
• Good real-time data + grading workflows
• Mature ecosystem for odds/market automation
• Better fit for enterprise-scale prop pricing and settlement

Best for custom, lightweight product builds

Stats Perform

• Very strong sports data and live updates
• Good for custom prop workflows if you’re building your own front end and trading logic
• Often chosen when data quality and latency matter a lot

Best for quick integration and broad sportsbook tooling

BetGenius / Altenar / OpenBet ecosystem

• More “platform” oriented
• Good if you want a sportsbook stack with props as part of a larger offering
• Usually less flexible than building on top of pure data + trading APIs

Best for highly customizable niche prop markets

Genius Sports

• Strong live data infrastructure
• Good for in-play markets and official league data in many cases
• Useful if you want granular event-driven props and fast settlement

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What to look for in a prop betting engine

For your use case, the important features are:

1. Live stat updates with low latency
2. Market creation API for new props on demand
3. Automated settlement/grading
4. Configurable rules engine for pushes, voids, overtime, etc.
5. Pricing/odds management
6. Scalability for many concurrent live props
7. Official or near-official data feeds
8. Audit logs and compliance tools

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Short recommendation

• Enterprise sportsbook / full prop engine: Sportradar
• Best live data quality + custom build: Stats Perform
• In-play / event-driven props: Genius Sports
• Full sportsbook platform with less custom work: OpenBet / Altenar / BetGenius

If you want, I can also give you:

1. a side-by-side comparison table,
2. the best options by sport (NFL/NBA/MLB/soccer), or
3. a reference architecture for building your own prop market engine with live stat updates.