What is the difference between OKB and OKX?

Could you please elaborate on the key differences between OKB and OKX? I'm particularly interested in understanding their respective functionalities, use cases, and any notable distinctions in terms of performance or value proposition. Additionally, I'd like to know if there's a significant difference in their adoption and popularity within the cryptocurrency community. Could you also explain how these differences might impact investors' decisions when considering either OKB or OKX?