Why don't you try to trade both of them?
On the Waves platform (Waves DEX) you can increase your Waves by trading tokens such as TurtleNode, MRT, and others.
And also do the same thing at ETH. There are Etherdelta and Forkdelta, you can buy a token and sell it at a good price, just like you trade Bitcoin and other coins.
I think it's more profitable than you choose one of them.