Over the years I've found the strongest large combi spanner's to be elora 205 series. I've regularly put 3ft lengths of pipe over them with no bending. Expensive new but normally a bargain secondhand.
No, all made in the good ole US of A. Had most of my (extensive collection of) Craftsman tools for between 20 and 30 years.
I only recall one item failing on me and that was a 1/2 SD 14mm hex socket. To be fair, I had hammered it onto a slightly rounded off 9/16" bolt head and whilst it split, it did undo the bolt!
Fair play to Craftsman (Sears) they replaced despite me telling them exactly how I broke it, and their warranty at the time limited to the USA!
Unior are my weapon of choice these days, not cheap though, similar in price to the quality German brands. Speaking of which, Stahlwille and Hazet make lovely spanners.
I think a couple of the guys have recommended Draper Expert as a budget option. I have a set for abusing and to be fair they don’t bend or break. They also don’t get into tight spaces as they’re so chunky, however that may not be a problem depending on what you’re using them for.