I am rather new to crypto but have used Binance / Coinbase and btc-alpha.

If you meant what coin do I use to buy fiat with to then trade for other currencies ..... I have used Bitcoin and ETH and a couple others I am forgetting. From my short experience Bitcoin is the worst coin to use in this circumstance due to its transfer fees. So if you plan on buying a coin to immediately trade for another stay away from Bitcoin as you will loose value.

As a side note .. I can no longer get into my Binance account as my 2FA is no longer working. I got $1000 invested there also. I am sure I will find a way back in sooner or later. I currently mostly stick to doing bounties for crypto.