A while back, Ethereum was hacked and a huge portion of the coins were stolen. The community chose to fork the Blockchain creating a clone of the Ethereum network, the only difference being that the developers and community all moved to the new version. Vitalik could have closed the old Blockchain but for an unknown reason, it was allowed to survive and is now called Ethereum Classic. The new Ethereum has a core team with stakeholders and new features but it is still centralized. The centralization of Ethereum improves the speed of decision making and the speed in the advancement of the technology.
But what about Ethereum Classic? They are decentralized. This means slower decision making due to the difficulties of getting large communities to agree. This also means ETC has no board that can make terrible decisions or that is beholden to large corporations. ETC is going to start getting developers very soon if they haven't already. I think ETC might end up being the early Androids that just couldn't compete with Apple, so they were cheaper. If that comparison is at all justified, then the significantly lower price on ETC would make it a smarter investment long term. It seems most of the crypto community is unsure about the future potential of ETC. I imagine a ghost town full of state of the art future tech waiting to be used.