Youd be taking a pretty big risk buying into either one right now. Eth is just waiting to get dumped but if u had to buy one then i think the hard fork is the one to choose since it has the highest value but that could soon change. They probably shouldnt have forked in the first place so classic is the one that is the original but like above poster says that could be abandoned completely. Investing in either could potentially be you throwing your money away.
Look at this tweet from an original developer.
https://twitter.com/MrChrisEllis/status/757293299426271232He is playing it safe by claiming they support both chains. Why? Because they want to have the room to move on to one chain if the other one is going down. This is just speculation but it also makes logical sense. They know they took a risk with doing the hard fork and by claiming that they still support the original chain will make them avoid paying for the risk taken. So they can get that cake and eat it too. The only person who cannot do so is Vitalik. He is the one who made it possible for the hard fork to happen and I cannot imagine him going back to the original chain if the Ethereum fork "supporters" leave. That would be too funny.