Another Rambo fan. I have some that are 10 years old and still very functional. I have them retreated for waterproofing every few years. They fit MOST horses well - although if you have a short horse, they are usually too deep through the body.
Another long lasting brand is Bucas - also expensive, but also lasting for years and years.
I’ve tried a lot of brands, and those are my favorites. Weathabeeta is probably my next favorite - tends to fit a lot of horses well - and they tend to last a few years (but not as many as the Rambo and Bucas). And in a similar category is the Dover International blankets - although not as sturdy, I’ve had a few rip, but Dover has a pretty good warranty policy.
Schneider blankets are so binding on shoulders, they usually end up causing rubs, and the two I had both lasted through 2 seasons then died. SmartPak are also really binding through the shoulders. Most other brands I’ve tried have caused shoulder rubs pretty quickly.
Part of it is finding what fit works best for your horse… And be careful how you wash the blankets - regular detergent will strip out the water-proofing in many blankets.