USDT is the default option because it's more popular and widely accepted stablecoin, giving you better value and making transactions easier on top of providing protection against volatility. Plus, it's available on decentralized exchanges, which is great for people who prefer not to use centralized platforms.
Marketshare: USDT counts for more than 50% of global stablecoin usage, and more than 50% of that is USDT on Tron.
Cost: USDT is more widely used globally and has much higher liquidity than USDC. this means you save more with USDT—100 USDT will get you better value than 100 USDC.
Time: not all providers accept USDC, so using USDT helps avoid extra steps like getting apps directly or connecting your warm wallet to dapps.
Access: many users don’t trust centralized exchanges with their personal data or financial assets. USDT is more accessible overall and available on decentralized exchanges.