The problem with the NSX is its a 90 degree v6 that requires significantly splayed journals to run smoothly. Compare our crank with the m3 crank in the picture. Which one looks simpler (and therefore "stronger" all other things being equal)?
Fun story, the reason that M3 crank was on the balancer that night was because a few days prior during testing we broke the crank that was in the car, and had to put in a new one, haha. To be fair to the crank, it had a rough life - 100k street miles followed by two trips up Pikes Peak before being turned into a race-winning endurance car...but, at any rate, I've seen firsthand more inline 6 cranks break than NSX cranks