IBKR wins hands down.

Btw, did you know TDA is banned in Msia and we can't really download the app from the apps store?

Anyway, TDAmeritrade registration is super long, there's like a thousands things to fill in and will take them a long time to process. And mine got rejected (during MCO) because I didn't have a passport. I'm about to sign up again with them just for diversification purposes.

Meanwhile, I'd recommend just go ahead with IBKR, the forum here is very active and everyone is using it.