I own Darts and Irvis.
I use Irvis on everything moderate with no issues. If I know that I will encounter lot of very steep terrain, ice or proper mixed (more than III UIAA/M3) I will use Darts that are quite lightweight too. They are a dream to use on rock in mono configuration.
Far superior to standard dual horizontals in my opinion.
Can’t find any real differences between 10 points and 12 as long as you are using proper technique.