Definately Ethereum as Erc20 platform is great and adopted by many projects around the world while waves is a little localised in comparision to Ethereum.
I am holding both waves and ethereum but i dont think that Eth will outlive Waves because we all know that the future of Waves is very bright and we also know that it is the best altcoin so i dont believe that Ethereum is more better than Waves.
For me I think waves is way far beyond ethereum, i think it is not comparable yet to eth at he moment, because we know that ethereum is very popular already and it has done so many tremendous job, while waves is only at its initial stage.