The main difference is the Harbor freight ones are blue, usually.
Wait for an online coupon.
Paul has a 2011 post called “Aluminum Clamps- retrofit makes perfect clamp.”
In the comments he said
8 SEPTEMBER 2014 AT 6:20 PM
Both Universal and Jorgensen are lifetime. I like the aluminum because of their lightness. I don’t like steel clamps much. Pipe clapms are good too. I like them. On the otherhand, I use the HB type and have found them more than adequate once retrofitted. I have used mine for many years at the schools I have had and they work there so in a home shop used once or twice a week they should last fine.