Ethereum, because there are not ASICs for it. See the news about recent crackdowns on mining in China, that's where all the GPUs were at, mining Ethereum.

Ethereum is moving away from proof of work

While this is true they are taking their time. Here is an article from 2017 that suggests they will have finished the transition to proof of stake by 2018:

https://www.crypto-news.net/what-does-ethereums-proof-of-sta...

I'm just making up hypothetical my friend. I can't really predict what these might be useful for as an alternative to gaming, but the world is full of bright people who exploit any opportunity.