Yes well said above poster, all altcoins actually depends on the bitcoin prices, but if you are asking against the bitcoin stability then Ether shows good resistance in this month.
Although you said etherium is good but its not stable coin since there is no stable coin so far. All altcoin is volatile and the price is up and down so quickly. Actually look for stable coin will not help because we are going to take profit from volatile moves. Etherium and bitcoin are always good choice.