I had the Skow's installed in a SE CU24, and as advertised, they do everything the 85/15S (when "praised" in some reviews) are supposed to do. They preserve the look of the guitar with the reverse zebra coils, and sound like what the 85/15S is supposed to sound like (Pronounced Highs and Bass clear , articulate) . , I think they do everything the 85/15S is supposed to do but does not quite get there .... It would be interesting to see how they compare to 85/15's.. (both sets American made)
I think my impressions of the stock 85/15S is "split" between a set that came in a Indo made guitar, and a Korean G&B set. I replaced the Indo set with the Skows. The G&B Korean set is still hanging in there, but they do not match the Skow's .The BUILD difference between the guitars is nothing. The Indo is finished as well as the highly praised Korean. But the pickups ? Not sure whether G&B makes the pickups in the Indo guitars.
As for what is best of the brands you mention ? I'm sure any of the types you have looked will be an improvement. I was thinking SD 59' Neck / 59 Custom/Hybrid' Bridge too ...
The differences between the stock & the Skow's are most apparent when coil cut. The Skow's do not get "weak" or "thin" whereas the stock 85/15S are wanting on that front. I was going nutz wanting a set of SE TCI's ... When I realized my Skow's already had the coil cut thing covered. ...
I recently went crazier and started researching a Baritone guitar. In the SE 277, PRS aside from killing the hot Tobacco Sunburst model, has 85/15S's installed in them. And in all the YouTube demos, the pickups that cried out the most for replacement were the 85/15S . And as Cheap / Moderate priced Baritones go , the 277 is the most expensive.
So one would pay $800 for the 277 (anticipating a price increase when they come back into stock) and still have to chuck out $250-$300 to upgrade the pickups. I'm thinking the Skows would be killer in the SE277
Only problem is you are now talking about an $1100 guitar, where the Brand F Cheapie Squire is killin it at $450 ...
But I could get sucked into a Dark Cherry Burst SE277 ,where I popped for Skows ...
if I don't go completely insane, and try a "SubZero" (not a 'fridge !) $400 insane , 30" scale Baritone instead (where the stock pickups are not all that bad), but Bare Knuckles has some Baritone models (Impulse) that whomp them
Figure about $700 total package once installed , and a monstrous 30" scale length tuned to an octave below standard E tuning (I'm talking myself into this )