For me both are great things for two different reasons :
-Waves offers a platform that will grow again and again in the future.
-Ethereum Classic will surely take most of Ethereum hashrate once this one will switch to PoS, and will increase in value from this.
Is more likely that Waves will grow in more percentage than ETC in long run,cause ETC has a very strong competitor ETH,also the first one has a price lower than the other.