Binance - Crazy transfer fees - Which network to use

Hi All,

New to crypto so not a trader - DCA was the way to go.

So I did my usual split between BTC and ETH on Binance (really safe play) and then went to transfer to my ledger - not your keys ... etc

The network that Binance comes up when I copy in the wallet address is Bitcoin which will charge me 0.001 BTC. This makes DCA unviable as its 50% of my monthly DCA amount!
On Binance, I can switch to the BNB Smart Chain (BEP20) network which will only charge me 0.00000039 BTC.

I was planning to do a test transmission before sending full amount. Before I start throwing BTC around does anyone have any advice?