It is right that bitcoin transaction are charges are high than most other cryptocurrency. But if you are talking to withdraw bitcoin from any exchanges that is not the true transaction charge , i think if blockchain is not so congested , bitcoin transaction charge is something between 0.00003 to 0.0001 btc ( dont know the exact amount) . But for Ethereum and erc 20 tokens transaction charges are mostly 0.0005 eth if network is not congested , sometimes it may go up to 0.002 eth depending upon network congestion whereas the transaction charges of litecoin is more less , for dogecoin 1 DOGE and that of NEO or GAS are 0. So i always prefer to withdraw in NEO or GAS and if that exchange dont support these currencies then in LTC or DOGE.