Ethereum will not beaten by waves, due to good reputation of ethereum in the market. Moreover waves price compared to ethereum had big difference. It's a dream come true if the waves beat ethereum.

.Waves is just the opposite to ETH probably. What they do is develop Bitcoin scripting, do everything using contracts, it’s very fundamental but makes certain things very complicated. Waves took another road, where things are simpler, very easy to add all functionality you need using plug-ins, don’t have to code complicated contracts. Also waves focus is on mass adoption, specifically target two markets : fiat transfers on blockchain and crowdfunding on blockchain. They are very ripe for disruption, and waves will be offering a product for a very general audience, basically the main end-user client is just a plugin you can install from Chrome or FF store.
  So in more simple term;

Ethereum is a smart contract platform which allows other project to run on it, waves is a gateway for investors who wants to enter the crypto space. I can't really tell which one is best, both have good prospect.

I guessed you've seen it in a website or something, because I think I also encountered such words like you said. But for me, Ethereum would still survives although waves rised up. And I don't believe on that fact, saying waves will be the next ethereum, although they both have my thumbs up, I think waves is still more way far than ethereum.

Everyone has their respective opinions sir, some people like Etherium and some like waves, and I tend to like Etherium because of its easy use. and for people who like to waves maybe because in the wallet there is a direct trading system

Ethereum is most popular crypto currency for every one i think.Many people life is changed from ETH.On the other hand also waves is not bad coin & this coin potential is good.

Each coin have their cons and pros. So I just support both of them

That's agreeable, but looking the current market situation as well in the wide spreading Eth has gained a larger support compared to the waves. Another important factor that makes Eth more potential is the large number of ICO programs running based on the ethereum Blockchain platform.

Ethereum is always going to be better than Waves. It was first of its kind. It was heavily adopted by crypto community since 2015 as I remember correctly. Waves is just a new guy at the school right now.

When we say Waves will be next Ethereum, it automatically make ETH superior than WAVES. Waves will always be considered number 2.
I still believe ethereum platform is much more powerful than waves one to create ICOs. Also due to large adoption of eth already it becomes easy to conduct crowdfunding.
For me Ether chain is still better than DEX from Waves.