Which network is better for USDT?

I'm quite perplexed about which network to choose for my USDT transactions. Could you please elaborate on the pros and cons of the various networks available for USDT? I've heard about Ethereum and Tron, but there might be others that I'm not aware of. Which one offers better scalability, transaction speed, and cost-efficiency? Also, I'm concerned about the security aspect. Could you guide me in making an informed decision?