Can I enter Binance generated BTC Address for deposit into Slushpool Payouts Wallet for long term use ?
Is this address fixed or changes from time to time and if it changes will the old address still be valid and I'll receive the money?
Or it's better to use other account like coinbase and than transfer to binnance. I just want to save on transfer time and fees (Network Transaction Fees).
There are pretty basic reasons why you shouldn't do this. Binance and other exchanges too ocassionally change your BTC address as a usual step of maintenance and you might be informed quite late regarding this. So it will result in loss of funds. Binance accounts generally have a minimum deposit rule which will obviously be harmful as you won't be able to receive your bitcoins over it.