Can't resist a comment or two, though I see this is a revival of an old thread. I'm new to HST, but not to bodybuilding.
In general I agree with jvroig's "a.)" and "b.)" points from June 26th.
Having said that, I seldom do triceps isolations, as I find that heavy medium grip benches works my triceps as much as my chest. This may be something that varies by individual, depending on arm length and other factors. I do use sets of curls, as I don't get a lot of biceps work from rows and pulldowns, as I am using pronated grip, not supinated.
I may try the latter with chins sometime to see what it does for my biceps. However, if my biceps are too weak relative to my back I wonder if I'll not be limiting my back development.
So, in general, I would prefer all compounds if all major muscle groups involved get a relatively equal workout. If not, one muscle group may give out first, limiting how hard you can work the others. This case might be the best reason for isos, and might be highly individual.
I also do wrist curls, as the only other thing that I do that would develop my forearms enough is deadlifts. I prefer straps for that, as I work out in my garage, and don't want sweaty palms to cause me to drop a heavy barbell on my garage floor.