Disclosure: this is an independent hands-on test. Both tools were run on ordinary customer accounts; neither company supplied review access or saw this piece before publication. For this test, I imagined a product page where shoppers could turn the little skeleton around. I wanted three things from the asset: its joints had to read as joints, the back had to survive a full spin, and the page had to carry the file without an absurd wait. I did not expect the most important byte number to ch...