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The second place you mentioned buys them from someplace else, even though they say they make their own,and they do not fit as well, I ended up sending one from them back.
AK will make your top in anything you want, Stayfast, sailcloth, vinyl. His fit.
Al Knoch for any C2 interior - best fit and finish - they stand behind what the sell. I bought leather seat hides over 20 years ago and they still look great - top in 1988 and it still looks new
I have installed many tops on C2's and without a doubt Al Knox is the way to go. They fit perfect and are correct. The only other one on your list that I recognize is Electron tops. I did not like the way they attach to the car and the way they fit. JMHO
I just bought one from Corvette America. Haven't installed it as yet but figuire if they have been selling them for probably more than 30+ years the fit should be good.