I think that it is better to switch to ETH today, it will continue to grow 100%. But the growth rate of bnb is a mystery. I think this is a good decision.
It is indeed a mystery, even with all the challenges they have gotten so far, their market value is still not responding negatively. Binance has really established itself for a very long future and I dont see any wave that would ever swim them away. If within the short period of time they were established, thy have been able to develop great idea that has halted any form of dumping, I can imagine another more 5 years of Binance.
Sentiment apart. I think Bianca will really one day top Ethereum, reason being that, we can see that ethereum is naturally not growing now except bitcoin bull run, whole Binance has been performing well without bull run, if any dump occur now, it will affect ETH and not BNB which may make the value of BNB becomes greater than Eth.