There are quite a few posts about this, but yes, residents of Singapore with Interactive Brokers Singapore Pte. Ltd. accounts (not Interactive Brokers LLC U.S. accounts) can trade SGX-listed securities. There's also a slight relaxation of margin trading rules since U.S. SEC rules don't fully apply, although that's an esoteric benefit. And it's possible (though not firmly established) that cash, in any currencies, when held at Interactive Brokers Singapore Pte. Ltd. by a non-U.S. person is not U.S. estate taxable. (U.S. estate tax applies to U.S. estate taxable assets above US$60K, the exemption for a non-U.S. person, upon the death of that person. The treatment of cash might vary between these two Interactive brokers entities.)
Everything else appears to argue in favor of Interactive Brokers LLC (U.S.) if you have a choice.