When exchanging stablecoins, the USDC/USDT trading pair becomes the preferred choice due to its high liquidity and wide acceptance. USDC is regularly audited by compliant institutions, has high transparency, and helps with risk control; USDT is known for its market depth, allowing for large exchanges to be completed in a short time. It is recommended to use limit orders or staggered market orders during the optimal liquidity time window to reduce slippage and transaction fees, and to achieve the best price by comparing exchange rates across multiple exchanges.