I'm slowly getting a feel for my preferences. It has to be a monosteel... and something at least a tiny bit less reactive like 1.2519. Could also be stainless or semi stainless, but ease of sharpening is a higher priority than maximum edger retention or hardness for me.
Profile... basically a KS but at 50mm to get more longevity out of it, similar kind of tip, but a fatter neck. Not 100% sure about handle though (wa vs western), and though I thought I finally settled on 240 for length I'm having some second thoughts after experimenting more with draw cuts lately.