Less volatile, low fees, fast confimations time are the things that we should search before decided to pick which coin is suitable for gambling purpose. For me dogecoin is the best one so far.
Doge will never die and I agree with all the factors that you mentioned. It's cheap and convenient to use.
I think btc was pretty good when the price of the bitcoin was lower but now the fees are very big, you can try ethereum now the price is not too high like the bitcoin.
It's opposite, when bitcoin's price was high - fees are high too.