ETH network is currently expensive to use but I know this would be a thing of the past once ETH 2.0 comes online with full swing. Both networks shouldn't be compared even though BSC was created to fill in for some of ETH biggest issues.
Only time will tell whether the ETH 2.0 will make any difference in the fees we are encountering right now, if you want to compare it is possible that BSC does have a working model because it is not that decentralized like ETH and you only need a few node confirmation to get the confirmation and so is the reason the transaction charges are low. The advantage is that BSC has a huge financial backing from CZ and they are monopolizing the market and you should not be surprised if they fork the coin without any consensus if there is a hack in the network
. The same can be said about ETH when i comes to consensus as they hard forked from ETC without consulting much.