TRON in my opinion this coin with the lowest fees, and I often use it, especially withdrawing USDT on the TRON network with 0% fee (withdrawal from the market) if on the network with only 1 TRX / $ 0.02 you can send TRX / token. I chose the TRON option because it was fast enough to confirm on the network. LTC fee is also cheap but it is a bit long waiting for confirmation on the network and this is only a coin like bitcoin, no token. But lately I often use BSC BEP20 (Binance smart chain) for trading on DEX, providing liquidity, farming, etc .. I switched to BSC because network costs are very cheap when compared to ERC20.