It is good time to buy NANO and TRON Crypto and use them. They have free transfers, near instant.
You are right in nano, the transfer fee is free. But don't forget that there were some significant changes to its ticker.
Nano has rebranded to a new ticker XNO and symbol Ӿ.
For Tron, there is still a fee but that fee is very minimal so, it's not really hurting at all.
Plus TRON blockchain is used in Tether USDT transfers. So NANO and TRON value can go up with time.
It's true that TRC20 for USDT is being used by many and that's why it's kicking and alive but, just like the other networks when you're sending USDT, there's always the fee.