There are many important things to choose an exchange. We should notice about withdraw fee and trading fee but it is not the most important thing. My first prioritization to choose crypto exchange is it must be a reputation one with high liquidity
Withdrawal fees maybe one consideration but should not be the topmost priority as there are some small exchanges charging low fees but you don't know how long they will process your transaction. Also, the liquidity is usually low so it would take days maybe before you complete your trading. So which one would you choose, you have assurance that you will get your money back in the time frame you are expecting it or pay for lower fees but no assurance when will get your coins back?
Indeed, we should not always compare the withdrawal fees like that. Sometimes it is correct that there are some exchanges that offers lower fees to make your transaction but not all of them are good at processing your transaction because some exchanges are offering low fees but they are delaying in making transaction. So it depends. Just choose on what makes your transaction convenient and safe.