How it works
TRON uses Bandwidth for transaction bytes and Energy for smart-contract computation. USDT TRC-20 transfers are contract calls, so both resources can affect the result and final cost. Energy and Bandwidth rankings cover the leading USDT wallets shown here; TronGrid does not provide a global resource leaderboard.
Quick answer
TRON uses Bandwidth for transaction bytes and Energy for smart-contract computation. USDT TRC-20 transfers are contract calls, so both resources can affect the result and final cost.
Primary sources
Protocol explanations are based on official TRON developer documentation. Live values should always be read from the network.