I would recommend only BNB to someone who wants to trade Defi on another platform other than Ethereum.
BNB looks like a solid buy now only because of the excitement on BSC with defi but there remains a lot to be seen once the hype has died down. Does BSC have enough good projects and good dapps like ETH does? Of course it does not. Does that mean the market price will be affected? Of course it will.
I am not of the impression that BSC is getting close to Ethereum now. Ethereum is the flagship in that area. The price is just climbing and climbing and it does not stop. I have no idea where the limit of this Ethereum bull run could be.