The core difference comes down to the font and print style, not the paper stock. Avery style tabs are printed in bold, all-capital Helvetica on both sides, giving them a slightly heavier, more graphic look. All-State style uses regular Helvetica in standard upper and lower case, which reads a little more traditional on the page. Both are built on the same 80 lb stock with a mylar-reinforced coating for durability, so functionally they hold up the same way in daily use. The choice really comes down to how your office or firm has standardized labeling in existing files — matching what's already in use keeps a large filing system visually consistent across binders and folders.