Both BTC and BCH become more and more precious. I think bitcoin is diamond and bitcoin cash is cash ... this one for storage and the other for transfer payment, they help each other and not vs!
Btc and bth is same but bch is altcoin so i think its more good of you hold bitcoin than bitcoin cash dont be greedy to much by selling bitcoin and buying bitcoin cash because maybe you'll regret someday if the bitcoin will go increase again.