To be honest, I am just using the Tron network when I want to transfer USDT between exchanges since it is cheap for withdrawal fee, besides that, I don't find any good thing uses of Tron.
But now there is already a lot of alternatives with Tron for transferring stable coins like USDT. Like Solana ecosystem which is they have already USDC/USDT SPL, which is you can receive USDC/USDT using the Solana ecosystem. There are still few exchanges using this, which I find quite a good alternative for USDT/USDC besides the Tron network.
Solana is interesting but needs more/easier on ramps......
" USDC/USDT SPL " - did you mean SLP on the BCH network or spl is from the solona network something ? BCH has a usdt on the SLP network, not heavily used, suffers like solana from lack of on/off ramps. Not a BCH baby but SLP tether caught my attn.