Any reason to choose them is appropriate, but in my view, each of them offers distinct value or utility. Despite holding more ETH than BNB, I still regularly used BNB during the last period because of some easy features, although the difference is not clear between the two, speed and transaction fee issues. It is also one of the reasons that we see so many people talking about them. This period can be said to be difficult for the entire market when the motivation for it to go up quickly is not much, so if you intend to invest in them, do thorough research and also balance between the different markets' profits and risks.