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!
I also agree because it is so cheap to send bitcoincash and white expensive sending bitcoin and there is some lag. Bitcoincash is so fast, it's perfect for smaller transfers. I think it's best to use Bitcoin as long term investment and to sometimes make bigger purchases and for the smaller ones bitcoincash. So the bitcoincash will be for the shorter term.