From my experience, both options can be safe if you choose a reputable provider. Downloadable wallets often give you more control over your private keys, while online wallets can be more convenient for everyday use. Before using any platform, I always check its reputation, security audits, user reviews, and whether it supports features like two-factor authentication and backup recovery. I also prefer using a trusted TRC20 Wallet for managing USDT because it offers fast transactions and low fees. No matter which wallet you choose, never share your seed phrase and always keep a secure backup offline.