Which network is best to transfer USDT?

I'm a bit perplexed about which network to choose for transferring USDT. Could you please elaborate on the pros and cons of the various options available? I've heard about ERC20, TRC20, and OMNI, but I'm not quite sure which one would be the most suitable for my needs. My main considerations are transaction speed, cost, and security. Would you mind guiding me in making an informed decision? It'd be great if you could also provide some insights into the reliability and scalability of these networks, especially in the context of cryptocurrency finance.