What you said is true, Miners are now seeking to give preference to BCH due to big block size and fast transaction but they are not seeing that the transaction fees is getting low for BCH transactions. Bitcoin is getting more difficulty level and transaction are getting back delayed due to this problem.
Then number of unconfirmed transactions have gone below the 50K mark for BTC, which is still quite high IMO. For every block newly mined, the BTC miners are getting somewhere between BTC14.50 to BTC20.00 due to the high fees. For the BCH miners, it is in the range of 12.5-12.7 BCH per block. I am not sure which one is now more profitable to mine, given the very high fee component with the BTC blocks.