Bitcoin as the main currency and doge as the alternative currency. Doge is the best coin for gambling because the fee is low and the confirmation speed is fast.
If gambling is being considered as source of money and someone is interned to choose bitcoin or any other crypto currency, then you are making biggest mistake of the life. Actually this gambling must be ignored. It isnt any source of money. So if the coin is doge or some other coin in gambling, you have to leave it as soon as possible. Live your life for better experience and job crypto.