Any cons choosing ibkr sg over ibkr llc?

To add on:

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IBKR SG has higher margin loan rates than IBKR LLC by about 100 basis points. If you are a heavy user of margin, this can be significant. Compared to local options though, they are still far ahead of the competition unless you are a HNWI where banks can offer lower rates.

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As a long term investor you might worry about US estate tax, and IBKR LLC by virtue of being located in the US means that its cash balances count towards estate tax. It remains to be seen that this is the case for IBKR SG, but given that it is a separate entity incorporated in Singapore, it is less likely that cash balances with IBKR SG count towards estate tax.

The key downside I guess is lack of SIPC protection which IBKR LLC accounts are subject to.

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However, I personally feel that this isn't a big deal since IBKR is a pretty well established broker (around 50 years history) and the largest by daily trading volume. What I'm trying to say is that with IBKR, the risk of fraud is quite minimal so even if they do go under, your assets should be safely held separately from the firm's. For example, when Lehman went under, customer assets were safe and SIPC wasn't even used.