BCH is going up due to Growing adoption by retailers, low fees, rapid innovation snd fast transsctions. Btc is now being used by large corporations and global exchange support for btc continues to grow.
Bcash is going up for 1 reason, the Koreans are buying it (70% of the volume), they like to gamble. Adoption my ass
Edit: Also, apparently some Chinese miners are buying bcash with profits from Bitcoin, probably through Korea.
Jiang Zhuoer, founder of the world's third-largest mining pool, BTC.Top
"To be honest, I do not care about bitcoin now, bitcoin cash is bitcoin. I earn by mining bitcoin, [selling it] and buying bitcoin cash. We mine for the most profit and buy bitcoin cash."