What is the difference between redeem WBETH or sell them?

I'm staking ETH on Binance, and would like to unstack them.
I have the wrapped BETH in my account, so I could trade these WBETH with ETH on the spot market instantly. I can also redeem them, but it takes 6 days.
1. What is the technical differences between both solutions? (For personal interest) 2. What is the practical difference for me? Will the amount of unstacked ETH be different?