IB accounts for active trading

Hi all, I'm going to open an USD 700k account for active stock trading in IB. In its site appears three accounts type (Reg T margin, Cash and portfolio margin).

I noticed that for cash accounts, proceeds of stock sale are available three days after the sale. Is that right?

In that case, I have to go for Reg T margin or portfolio margin account. Which should I pick?

Best Regards,
Jaime Zamora
 
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