ON3P Filthy Richs have the thickest edges I've ever seen on a park ski...and they're mint...usually by this time of the season I'm looking at getting a new pair of skis cause the edges are so screwed up, my FRs have 2 edge cracks total (only 1 of which came from rails).
I would say anything K2 as well. maybe line also? my older armadas from before 08 (AR5, AR6, and pipe cleaners) have better edges than my 11' AR7s. the AR7s have seen about 60 days and have 7 edge cracks, where as the other 3 have 7 combined. my 05' public enemys have 1
Edges are measured by different companies in different ways, some include teeth, some do not.
ON3P uses a 2.5mm by 2.5mm edge bar, not including teeth. Its ground a bit when we structure and finish the skis, but its the thickest we can get our hands on, and its Rockwell 48. If you are wondering difference between different types, higher the number the harder the material. Some may say that softer is better for impact vs harder, but so far as I know, nobody has done a published study on ski edges and rails to date.