Alternator AC DELCO or OEM Volkswagen

On that list, I'd only go with the AC Delco.

Only brand here I am confident with is ACDELCO, Wai I’ve installed due to customer already having the part but I cannot swear to its reliability.

AC Delco makes a good product. Alternator technology is really old, so it's not difficult to do right.

I have the acdelco in my old Comanche and it works great.

Personally the AcDelco would be my top choice here with these options going new and not a reman.

Honestly, even the AC Delco quality is questionable.

On rock auto I see new alternators from ac delco. Not sure about any of those brands.

I got 3 AC Delco remans from RA before they refunded my money and refused to send a 4th...The third they sent arrived fine but lasted 37 miles on the car before the front bearing locked up. Over a month of headache and ended up buying a Tuff Stuff alternator.

I got an ACDelco reman alternator from RockAuto, but it has a grinding feeling and bearing noise when I spin the shaft by hand. I'm not putting that "reman" alternator in the car only to have it fail a few weeks from now.

Spent 300 on an alternator to get the whole car apart just to find out it was the wrong one