Ziet has something to say about TSG vs IB. https://www.youtube.com/watch?v=fvwoBjGPG8Y&t=169s

That's pretty much the case. But IB's customer service isn't that bad last time I tried, there's free support via US toll free line instead of emailing back and forth with TSG.

Perhaps need more time to observe. Main reasons for choosing IB are the lower commissions and the availability of fractional shares trading.

This is IB's pricing: https://www.interactivebrokers.com/en/index.php?f=1590

This is TSG's pricing: https://www.tradestation-international.com/...ng-commissions/

In general, TSG's pricing should be more expensive than IBKR, since they earn fees and commission on top of IB. If the fees are cheaper, TSG would have gone bankrupt long ago.  TSG is introducing broker to IB, remember. IB earns as they should according to fixed/tiered pricing behind the scene, add that up with the fees/commission TSG earn, that would be the price shown on TSG's pricing page. 

For small volume, IB's tiered pricing is cheaper for US exchanges, HKEX, LSE compared to TSG. You can check the minimum fees and % fee per trade value.

The only exceptional case is SGX, IB's fixed pricing is cheaper for SGX for small volumes than tiered pricing, but still comparing tiered/fixed vs TSG, the former 2 are cheaper than TSG.

So in short, IB is cheaper than TSG for fees/commission.