I've revisited my short list of absolutely must have blades and I can't spot any sort of pattern ...
I've got the Chinese Super Gillette Blue, the Permasharp Super ... good so far. Rapira Platinum Lux, go figure! Treet Platinum, SuperMax Super Platinum ... okay, so perhaps a (faux) platinum thing going on? Nah, coz then there's the very plebian Vidyut Stainless (Economy) and the Wilkinson Sword Economie, which I prefer over the regular Wilkinson Sword. Silver Star Super Stainless. Treet Durasharp. Personna Comfort Coated, which makes sense as I really don't like the Lab Blues and Med Prep < remind me, they're uncoated? One washed? But prefer the regular stainless over the Personna Platinum Chrome.
Maybe I've a Jekyll and Hyde thing going on?
Given that the Treet Platinum is "platinum class" rather than platinum edged and I think that's true of the Rapira, too; perhaps also of the SuperMax, although I'm not sure what they sputter on so maybe that's the anomaly. The rest are simple stainless, with an erring towards the pedestrian. The Treet Durasharp is a modern carbon blade with PTFE coating. Personally, I've not seen them rust across 5 or 6 shaves and pulling old ones out of my blade bank, I'm not seeing rust. I do see rust on the crappy Vidyuts, though! Stainless???