to be honest both are very good, because there are lots of profitable token on ERC20 and BEP20 to invest, but right now I only buy token on BEP20, because in my opinion the gas fees from ERC20 are very expensive compared to BEP20, so that's what makes me not too interested to buying token on ERC20, therefore I hope ERC20 can fix the gas fees to be cheaper, so that I can also buy token on ERC20.