IIRC, Klenk is the original maker of tin snips. If I'm reading their bio correctly that was in 1934.
Never used any, but they seem strong as heck.
(Just found out that they've discontinuing their line of snips)!
Klenk Division of Everhard Products has decided to discontinue the manufacture of our compound action aviation snips. Increased automation in metal cutting has decreased demand for our heavy-duty hand snips, so we have decided to focus our attention on other Klenk branded tools we manufacture...
klenk.everhard.com
I've used Wiss, Midwest, Malco, and Lenox. Malco was my standard users for many years. A forum member gifted me with a trio of the Lenox - they have since become my favorites.
www.cutwithlenox.com
This company seems to have a good assortment of brands FYI.
Shop high-quality tin snips and metal snips tools built for precision and durability. Cut sheet metal easily with the best snips tools for roofing pros!
www.stortz.com
Here's my Wiss, Malco Zip Snips, and Lenox tools.