Seeing both bitcoin in the top 3 of the market share is kind of weird.
It is like Data and Lore from Star Trek are taking part at the same competition.
I also liked the Logos. They seem the same but Bitcoin is turning right and Bitcoin cash is turning to the left.
However I wanted to write a guide how to redeem bitcoin cash but I just found this amazing one instead:
https://bitcoinmagazine.com/articles/beginners-guide-claiming-your-bitcoin-cash-and-selling-it/
So in Short:
Back up your wallet and get private key
Transfer your BTC in another Wallet to have them safe
Install Wallet that supports bitcoin cash
Redeem using private key from original bitcoin wallet
If you want to sell bitcoin cash - send it to an exchange that support it - e.g. Kraken
Right now it seems bittrex is a good choice:
However it is tough to predict what is better A to hold or to sell - at the moment a lot of people seem to believe in this young new bitcoin.