dogecoin and litecoin at the moment. others scam altcoins are just bagholders trying to make some noise so they can dumps, included but not limit to monero, dash(digital ass), and nxt etc... etc...
I feel like dogecoin and litecoin are the true bagholders, but that is my personal opinion. Monero offers something new the table and fair mining across CPU and GPU which is closer to satoshi's original vision of 1cpu = 1vote.
People who ignore Monero as a serious contender for digital cash will be sorry in a few years from now. Obviously Monero is young and still building its foundation, but once that is established, Monero will have some incredible value to offer for everyone.
Litecoin is doomed by greed in my opinion, that and ASICs already are in the midst of ruining a coin I once was in favor. Dogecoin is a joke, plus with the way the infinite inflation is set, it will never gain value save for some pump and dumps.