For all you miners, what is your favorite coin to mine?

You are not going to make much with the Antminer S9. The difficulty rate has increased too much. Based on calculations from https://99bitcoins.com/bitcoin-mining-calculator/, you will probably make ~$99/m. Taking into account the purchase price, power, etc, there is not going to be any profit.

As for my favourite coins, I like LiteCoin as I got in early, Monero and DogeCoin.