Should I hold USDT or USDC?

As an investor, I'm faced with the decision of whether to hold USDT or USDC. Both are stablecoins designed to maintain a 1:1 peg with the US dollar, but they have different underlying mechanisms and are issued by different companies. Can you explain the key differences between USDT and USDC, and provide some insights on which one might be more suitable for my investment portfolio? I'm particularly interested in understanding the level of trust and transparency associated with each coin, as well as their potential risks and benefits.