Guys you need to read this: https://www.sbigroup.co.jp/english/investors/disclosure/presentation/pdf/180628presentations.pdf
Sounds like big news for BCH and Ripple. (look for cryptocurrency part)
slide 123 - Mining Status Centered on Bitcoin Cash; Reasons to hold BCH - 'ensuring liquidity, and for clearing purposes'
They do not want to bet only on one digital asset, they set their bets on Ripple, and BCH. Ripple for a remittance infrastructure, BCH maybe for 'clearing purposes' as says that slide.
Better is beside the point, they have first mover advantage and they're already making partnerships with banks..it'll cost them less money to work with XRP and ripple now they've begun
I think you only get he same functionality if there's a ton of liquidity on both currency pairs. Otherwise you have to charge for the spread and the banking from the exchange to fiat.