I would use ETH instead of Btc if I in ur shoes. There is almost 20 Cent fee and fast transactions.
Then you can easily exchange to Btc.
It's definitely cheaper to send ETH transactions right now. But you also need to consider the cost of conversion. You need to pay commissions to the exchange (0.15-0.3%) and then pay miner's fees on both sides of that transaction. And if the recipient needs Bitcoin instead of Ether, they will have to incur the same costs to convert back.
I've heard you can point the transfer fee by yourself but if you put a 0 fee the transaction may be going so slowly that it's never happend. And if you'll rise a fee the transaction would be faster than average. Is it true?
Indeed, a zero-fee transaction may never confirm. The best way to determine the cost of a standard transaction is to check
https://bitcoinfees.earn.com. You can decide how urgent your transaction is and pay accordingly.
For example, if you are willing to wait ~6 hours for transaction confirmation, you can pay 120 satoshis/byte right now. If you need confirmation in the next block, you need to pay over 800 satoshis/byte. That's a huge difference. If it's not urgent, don't pay for instant confirmation!