I think you are so new in Crypto. However once a time everyone is new in crypto like you.
Firstly you must know what are the differences between all of the networks fees.
All are totally differences networks.
You said you want to withdraw Bitcoin so must select Bitcoin network because everywhere won't support others network for Bitcoin. So when you want to hold your any coin you must try to use main network for your coin. So you won't fall in trouble in future.
Hope you will understand.