So riddle me this batman. If these things are so badass how come they come in metric and sae?
umm..... because metric and sae are different sizes robin.
yes there are some metric and sae sizes that are very similar. everyone knows that, but there are some sizes that are not. always, the best option is to use the appropriate size first. no matter whether it be sae or metric. if the fastener is worn or damaged, then you need to start hunting.
if you have used a quality spline socket or wrench (sk, bonney, snap-on etc,) in the correct size you would know that they work and work well. if you are using one of those off brand one set fits all sae/metric sets your experience will more than likely be different.
i have not used the sets the op lists but i would wager that they work and work pretty well. when push comes to shove the truck brands rarely offer something that doesn't perform at a pretty good level or the **** hits the fan and it usually never ends well.