On this hand, one pair simply preempted 4♥, another used an artificial "strong" 4♥ preempt auction, and the other opened 1♥. I am not sure if we can draw a lot of conclusions from this, but the direct preempt on this hand looks harder for NS to "get right" than opening either 3NT or 1♥ (or 4♣ as namyats as surely north would double and NS could find 5♣)
Adam opened 4♥ and east west never got into the bidding. four hearts made for a tie for top.
Richard Jeng opened 1♥ which allowed h is opponent to get in a preemptive 3♣ bid which could have easlily lead to a 5♣ contract.
Anam Tebha opened a modern 3NT showing a good preempt of 4 of a major which also allowed her opponents to enter the auction at a convenient level. This time NS foud a good 5♣ save, it was so good in fact that on the diamond lead it got, it could have made, but even down two was a top board for NS.