USDC Network Lowest Gas Fees ADVICE

I am looking to buy and transfer some USDC to cash it out.

Available networks are Ethereum, Solana, Polygon, Stellar, Abitrum, Avalanche, and Optimism. Which one would have lowest gas fees to send USDC? Any caveats specific to USDC on that network also?

Finally, any advice re best app or service to receive and cash out said USDC?

Thanks!!!