Binance offered competitive trading fees, especially if you used their native cryptocurrency, Binance Coin (BNB), to pay for fees.
Kraken had a reputation for having relatively low fees, especially for trading on their platform.
Coinbase Pro (formerly GDAX) typically had lower fees compared to Coinbase's standard platform.
Gemini was known for its transparent fee structure, and it often appealed to users seeking a user-friendly interface with reasonable fees.
Bitstamp was another exchange known for competitive fees, especially for users in Europe.