Both these coins would do relatively good in the future. They have use cases and any project with use cases and a good development team behind them would continue to grow.
You can see at this time for both of them so that you can better know who is already superior, because Polkadot and Uniswap are still running and living well, thus making comparisons easier, where Polkadot is already able to rank in the top 8 cryptocurrencies while Uniswap is still outside the top 10 cryptocurrencies.