From Brave search ai or Leo:

Decentralization: Polymarket is a decentralized prediction market platform operating on the Ethereum blockchain with Polygon for scalability, offering lower fees and greater privacy. PredictIt, on the other hand, is a centralized platform regulated by U.S. authorities, imposing limits on trading and market creation. Fees: Polymarket's decentralized nature results in lower transaction costs compared to PredictIt's centralized platform with higher fees. Market Variety: Polymarket offers a broader range of markets, providing more flexibility in trading. PredictIt, while accessible to U.S. residents, has a limited range of markets due to regulatory restrictions. Accessibility: PredictIt is accessible to U.S. residents, while Polymarket is not, due to regulatory restrictions.

Comparison of Odds

Kamala Harris' Appointment: Polymarket predicts an 81% chance of Harris being officially appointed as vice president, while PredictIt forecasts 85%. Trump's Presidential Odds: Polymarket's traders signal a 72% chance of Trump retaking the White House, while PredictIt's odds are not explicitly mentioned in the provided search results.

Scoring and Reliability

Polymarket: Considered more reliable than PredictIt due to PredictIt's high fees and low trading caps, which can reduce price accuracy. Election Betting Odds: An aggregate of real-money prediction markets, including Polymarket and PredictIt, provides a consensus forecast.

In Summary

Polymarket and PredictIt are both prediction market platforms, but they differ significantly in their decentralized vs centralized structure, fees, market variety, and accessibility. Polymarket's decentralized nature and lower fees make it an attractive option for traders seeking greater flexibility and privacy, while PredictIt's centralized platform and regulatory restrictions limit its market offerings and accessibility.