I want to buy $150 USDT and send it to an address. Is TRC20 cheaper or BEP20?
Usually it will be cheaper to use the BEP20 (BSC) network. But what is certain is, check first on the exchange or platform, usually there will be a fee statement and also the minimum withdrawal that must be issued. Who knows, there are different platforms. In terms of speed, both of them are quite fast so far.
The most important thing is when choosing the network, make sure that you choose the right network. If it's BEP20 then you have to make sure the destination wallet is correct, namely the BEP20 wallet (BSC) and if it's Tron, then use the Tron network. Don't make a mistake because it could result in the loss or non-arrival of assets at the destination exchange or wallet.
both blockchain have different address because I presume tron used a heavily modified EVM in which also change the address formats thats why if you are inserting your tron wallet in BEP20 wallet or either you are inserting your BEP20 address into tron the app will usually detect mistake so no need to worry about that.
regardless i'd be more worried with the existence of dapps deployed in both blockchain since I think the amout of dapp in binance smart chain was definitely so much more than tron, but if its matter of sending stablecoin then I guess tron will suffice but usually exchange has fixed rate of $1 for sending USDT so thats can be a concern.
regardless couldn't go wrong with one of the two, they are just as cheap in term of fee and as fast.