As long as i know, there is no network more secured then ERC20 now, but it is too expensive. Why erc20 moee secure ? Because it has been hacked so mny times and TRC20 never getting hacked so no improvement in security. Erc20 also has many nodes keeping the security of it, TRC20 more less.
If we're talking which blockchain network is more secure then the answer is BTC because it has no intention of switching into PoS and PoW by far is really secure.
However TRC20 doesn't get hacked as often doesn't mean it's lacking in security and untested. They could analyze the ERC20 hacking and implement additional security to the blockchain even before the hacking occurs. It's really hard though to decide which one more secured when we don't really know what's exploit is left undiscovered out there.