Both are good investments, so the safe choice would be to hodl a few of both. I personally think waves will has a better chance of going 10x from its current price, than Ethereum has.
my personal prediction about ethereum are the value itself must be at least 20% of bitcoin value . which means if bitcoin price are $10,000 then eth should be at $2,000 or so and so on , it still has a future to grow for eth .
but yes , waves for now it has a lot of space to grow with how a lot people get frustrated with bitcoin market.