As many others have posted that PB Swiss drivers are the ones to consider as the best.
Post's made here have mostly highly recommend below (not in any order):
Vessel, Felo, Wiha, PB Swiss, Williams/S-O, Hazet and to some degree Wera and soft cushioned SK (made by western forge).
My experience:
PB Swiss: Last night I bought a bunch of PB Swiss bits, hex and drivers as Tool Lady is having a 25% off sale right now
but also have to say I had two (3.5 & 4mm) soft grip slotted blades bend (see pics below) and wear out on me way prematurely (bad batch?) and the soft grip is hard to clean even after aggressively trying. The grips are very good, can get good torque but found my Felo 550 more comfortable and the slotted tips are holding up much better.
My PB S. phillips heads (#0,1,2,3) don't even look worn after three years, very impressive and completely opposite to my slotted ones.
I just ordered a bunch of hex bits for my drivers to test out and I suspect they're better than anything else and prices are good for them.
Felo's: A couple of posts here were about some disaffection for their Felo drivers, I love my 550's and reach for them before I reach for my PB Swiss slotted but I have the high end 550 model much more expensive ones, not the wood ones. A couple of days ago I received the wood handle set for $19. I was needing a set for my to go kit but have to say the quality and finish is no where remotely as nice as my 550. The 550 are machined and milled finished, the wood ones are not. Having said that, for $20 I doubt anything can beat them, They would make for a great beater set that you don't have to worry about; designed to strike with a hammer, has a hex bolster and has a tough satin chrome finish. If you linseed oil them, they will be beautiful and timeless but please Dont don't compare them to a PB Swiss or better 550 Felo's. Wiha also makes a nice wood set.
Wera's: Recently I also pulled out a set of Wera's to revisit and compare. I agree the handle is very nice and I think the tip finish and fit sizing is the best out there but they do wear out rather quick and softer than the PB Swiss, Felo's, Wiha, Williams. I say they could be the best for lighter use and low torque shops and prices are lower than the ones mentioned above; the handles don't torque as well as Williams, PB Swiss or Felo's. I would say Wiha (germany) have stronger tips than Wera (czech). I love my small precision Wera's for feel and tip fit but find the shafts too long and twisty and are going away, prefer using my Felo's and Wiha's.
Williams: I bought a set after having issues with my PB Swiss drivers and since they were on deep discount I would feel better when trashing them. Have to say they're really nice, no real complaints other than the tips were slightly softer than my Felo's and PB's (PH heads). Other than that is ergonimics preference, the handle is hard but has the best torque but not the most comfortable. And there made in USA.
SK: The soft grips are made at Western Forge (USA), exact same set as Craftsman Pro. They're pretty expensive for what you get and have about the same or slightly less wear than the Williams. I use a 1/8th slotted everyday and love it but I do have to fix the tip edge on occasion.
Again; Personal usage, costs, ergonomics, feel and specs can tip the difference to what you like better and mileage will vary but there does seems to be a overwhelming consensus of about four to eight manufacturers to safely consider. Go review other threads and sites and you'll see similar opinions. And of course they're other excellent ones out there but these seems to mentioned the most thumbs up.
PS Swiss #1 (3.5mm) slotted barely used and soft, it was replaced but......