Behind "trc20 vs erc20" sits one idea: the coin is the same, the road it takes is not. USDT TRC20 is the version of USDT issued as a TRC20 token on the TRON blockchain, and it is one of the most common ways to send USDT because fees there are usually low. The same coin also exists as BEP20 on BNB Chain and as ERC20 on Ethereum. Each version has its own fees and rules, and a balance on one network never moves to another by itself.
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TRC20 vs ERC20 sets TRON against Ethereum. ERC20 fees, paid in ETH gas, are often far higher when Ethereum is congested, which is why many people prefer TRC20 for small USDT amounts when the receiving side supports it. Support is the deciding detail: some platforms accept only one of the two, and some take a network for deposits but not for withdrawals, so each page needs its own check. On any route used for the first time, sending a small amount before the full sum proves that the network lines up.
What is the BEP20 network? Strictly, BEP20 is a token standard on BNB Chain rather than a network of its own, though wallets and cashiers list it as one. USDT BEP20 is the version of USDT issued under that standard, and its fees are paid in BNB, the native coin of the chain, usually at low cost. Addresses on BNB Chain start with 0x exactly as Ethereum addresses do, and one address can exist on both chains. The look of an address therefore never shows which network a payment is going to use.
Its network list for sending and receiving should name TRC20 or TRON explicitly; supporting USDT alone says nothing about the network.
Ethereum and compatible chains share the same address format, so one 0x address can exist on both while the balances on each stay separate.
BNB, the native coin of the chain, so a wallet sending BEP20 tokens needs a little BNB.
Not reliably. Addresses on BEP20 and ERC20 share the 0x format and may match exactly, so the network is picked from the list and matched on the receiving side.