Bitcoin is king and Bitcoincash is PAWN! Lolz.

Thats the difference between them for me and I dont wanna go in much detail as the comparison is really vain here. 

Majorly bitcoin is first algorithm that was formed and copying the code from the same tech they forked BCH with little changes in it so that they can scale it up and do more transactions or be faster ! But really that doesn't matter these days as BTC still stands as king. Thats why I said difference doesn't matter here. Who agrees with me !