Great question, selenium usd is layer 2 and will not be able to gain the adoption we want evern though is good
USDC- is a centralized entity who can blacklist the collateral of foreign exchange in the future if we begin having lots of success
Usdt - bridge risk and complexity for investors to manage
Ustr- layer 2 but also promising project.
USTCC advantage is having a L1 Native Stablecoin for not just LUNC but all of cosmos. No bridge risk, no blacklist risks, not in layer 2 and over collateralized while buying back and burning USTC making investor whole while our collateral grows with USTC. We can even use USTCC as main collateral source for the Forex which will accelerate even more the USTC buy back and burns.