Obviously BTC is the superior chain, with malleability fix (segwit) and Lightning Network transactions. It'll help spread the already biggest adoption in crypto. Everything about it pretty much is better there including the variety of developers, size of userbase, general safety and innovation.


BCH tries to scale the old-fashioned way, constantly increasing the blocksize, but it has way more problems. There aren't many users there, mining is way more centralised, Coingeek and Bitcoin ABC having fork-wars and threats from both sides.
Bitmain is also a huge factor there, having converted a ton of their BTC to BCH, they're now stuck with an asset that's worth a lot less, risking bankruptcy.