I'm sure everyone here will suggest Bitcoin and Ethereum for the first couple, because we know that almost everyone uses Bitcoin and Ethereum. And as an advanced option you can choose several coins with a high level of popularity and one more, don't forget for the USDT pair.
EOS and Neo can be a good choice too , or Waves they have potential growth through the use of their platforms that can be a big help for early adopter.
but for myself the crypto pair that I use is bitcoin and ethereum because my dream can get a big profit from both of these coins and both of these coins are also many investors who trust
yes, indeed bitcoin and Ethereum are currently being chosen to become crypto pairs that many use and believe, but Neo and Eos, in my opinion, are also good for being able to be used as a crypto pair in the future, but it returns to the choice of each -one to be able to choose and ensure everything.