I'm not a holder of any exchange token except holding some bnb in wallet probably as for trend and trusted by people which is performing as okey. Otherwise exchange tokens aren’t sound good invest as those are useless in most of the cases. exchanges token are kind of so call token just act for giving 10-25% discount if you use that token for transaction in its platform. Otherwise no real use of it and most of the time those perform as dump in the long.
so far I agreed that BNB having the most utility nowadays, the others are just giving some discount which doesn't make sense since 25% discount of the fee trading is kinda absymal.
but if its used for staking like BNB for the sake of getting new quality coins that might have the potential of tripling its value then it will be worth it.
and so far the only exchange that could realize such concept is only binance.
for that I guess the reason why their BNB is having quite high market capitalization, added with the fact that they have bsc in their service.