Yes, a PM call requires you to add funds or reduce faster. A Reg-T call has more time. I can't speak to each brokers liquidation policy. In most cases, you have more room with increased leverage overnight with PM, so it is not a fair comparison. You will breach REG-T much faster.
It seems PM is mostly for books with offsetting positions? Like long CL and short NG? Or long NASDAQ and Short S&P ETF?
For my trading account, I do not see the difference of PM vs regular margin. So for simple trading book, probably PM does not matter much.
With IB, the BP is 6 times net liquidation value. The value is far lower with Reg-T margin.
But for commodity, it probably does not make any difference.
Before IB had the intra-day margins. But I think that and high BPs are actually harmful for most traders. When brokers offer low margins and high BPs, traders take more risks than they should.
PM is for traders who know what they're doing. That means being diversified and uncorrelated. It also makes a difference for commodities of course.
Reg-T has intraday and interday that are different. For PM, there is no difference.
What you said is not accurate.
For IB reg-T margin, I do not see intra-day margins any longer. At least for the contracts I trade, the intra-day and overnights margins are the same.
It is such a strong statement that PM is for traders who know what they are doing. So the traders who use Reg-T margins do not know what they are doing?
For the stuff I do, PM does not make any difference. I have different books that hold different markets. So I can keep things simple. I do not even want high BPs. High BPs and low margins are not even for most traders.