Regarding anti-slip wrenches.
For a professional mechanic, I can't imaging not having a set in my tool kit. For a home mechanic, the need is less...perhaps.
I work mostly on motorcycles where the fasteners are often within eyesight. So I specifically don't want the type of AS wrench that will actually leave teeth marks in the fastener. For motorcycle work I really prefer the SK long pattern wrenches, and I personally prefer them when I work on my cars too.
That said, I think for a guy like me the Proto AS wrenches are the absolute best of the best. Because the design is such that it gives you that feature (admittedly not as aggressive as WrightGrip or FlankDrive), without leaving marks on the fasteners.
I have some Proto reversable ratcheting black chrome spline anti slip combo wrench. (say that 3 times real fast)
Basically this wrench
The only "flaw" I can find in this wrench (if you can even call it a flaw) is that it's not a long pattern wrench. The length is the same as a US made Craftsman raised panel...which isn't exactly short, but it's not as long as the SK long pattern wrenches.
If I were buying today, I would honestly pick the set I could get cheapest. If Proto makes a long pattern and it's the same or longer than the SK then I personally would be quite happy with those...I really like long pattern wrenches...but that's a VERY subjective thing; may not be all that important to you.
I have had a set of the SAE SK long pattern wrenches for the past 25 years and while they're a dated design, I would gladly buy them again today; I absolutely love them. If price were the same, I'd buy the wrench that is longest; I really don't care about anti-slip feature, it's not important TO ME, but you may be different.
If the Proto were at least $30 cheaper, even if they were shorter, I'd buy the Proto. Because they're both VERY good wrenches. No they're not as good as SnapOn but then again they're WAY cheaper. A 13 piece long pattern set of SK's can be had for under $200 and that's a decent price for a wrench I just love.