I don't use either, but i would suggest you to check these as part of your research.
1. Check whether their withdraw fee is only network fee. One way to find out is by comparing it with TX fee recommendation on https://mempool.space/.
2. Check Bitcoin price/buy rate with other exchange. You can use https://www.coingecko.com/en/coins/bitcoin as comparison.

If you plan to enable auto-withdraw with minimum amount, take note you'll have lots UTXO. It means you'll pay higher TX fee if you plan to send big amount of Bitcoin.