Polygon has been pretty good for the ETH fees yet it is only good if swap works. Polkadot on the other hand has been cheap than ETH. I have written an article comparing these two cryptos, you may want to read it :) Check out the article: https://hive.blog/hive-167922/@esmeesmith/polygon-matic-vs-polkadot-dot https://leofinance.io/@esmeesmith/polygon-matic-vs-polkadot-dot