I'm one of the Zclassic devs and I just wanted to say that the difference between Zclassic and Zcash is pretty major.
In many areas Zclassic has been leading the way in terms of usability and implementation... We funded work for the first Windows wallet and we also released the first open-source mining pool software. There's much more to come on the roadmap too.
Oh! one of the Devs of Zclassic coin which he already stated the thing that differ it from ZEC. Actually i didnt tend to invest money on both coins but seeing on the status of these 2 alts i could say they are just both the same.One is just a super hype coin and the other one is just a copy coin.No hurt feelings but this is just my own view and opinion.