I have metamask and trust wallet. I can dowload the bnb smart chain on my metamask but of course I can't see the eth coins. The only way I can use both is to erase the bsc smart chain to go back and see the eth coins. Is there a way to just swtich back and forth in seconds for convenience?
firefox has helped me a lot thank you.
You don't have to. Just change the network from the top. Use Ethereum Mainnet for viewing your ETH balance and using ETH Defis, switch back to Smart Chain for bnb balances and tokens. You can use the same address (with privatekey or mnemonic phrase) to depsoit and withdraw both ETH, BNB and their tokens. Though the two balances don't interact and you'd need an external bridge to convert between them.