Erc20 is the Ethereum chain. Those are considered better security-wise as Ethereum is arguably very decentralized. However, their fees are extremely high right now. BSC is NOT decentralized so that can be dangerous. But, their fees are very cheap relative to Ethereum. So, pros and cons. High fees, more security. Lower fees/less security. That said, obviously BSC would be in danger of killing the golden goose so they are highly incentivized to secure their network as strongly as possible. But, it is still a "single point of failure" so it is definitely still considered a risk.

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