They can not be compared because one is a matured project and the other just started its new life.
Also, BNB has limited functionalities if compared with ETH.
yes, based on function, of course the BNB still has very limited functions. but, in terms of prices, I think BNB can be a new challenger for ETH. even though it's still quite far away, but the potential in the future I think is quite good. it all depends on the future development of binance.