Philosophically I like ethereum classic. I appreciate that it stood on the immutability of the blockchain principle. In my opinion ethereum fouled up with The DAO in 2016 and hardforking to recover the funds was a mistake. Like any other investment there is risk, the vulnerabilities had already been known and published and the The DAO should have accepted the loss as a painful lesson. Instead hardforking to recover ethereum set a precedent for censorship and the Ethereum Foundation never fully learned an important security lesson.
As a practical investment I think ethereum is better. As an open source cryptocurrency anything ethereum can do ethereum classic can also do and vice versa. The only real significance in difference is ethereum classic's monetary policy change to cap the total supply of ETC last December but I don't think that's enough for ethereum classic to compete for the foreseeable future.