buy bitcoin or bitcoin cash? I have some bitcoins on coinbase and was going to buy more. 

But now I see bitcoin cash available on coinbase. 

Should I buy bitcoins or bitcoin cash? What is difference? And they have the same price?

UPDATE: They have different price, so it looks like new cryptocurrency.
Bitcoin cash, is centralized, and it is difficult to run a full node of it, and it does not have a great developer strenth.

Bitcoin (the original) have many developers developing new tecnologies like the lighning tecnology. And it is fully descentralized. But the mempool is crowded right now wich makes the fees quite high.

I think in the short term Bcash (Bitcoin cash, nickname) will be more usable, with lower fees, but in the long term in cannot compete with Bitcoin.