Cold Saws

[kunfuzed]

So in the world of cold saws,  what's the advantage to the high speed blade over the slow speed blade? I though all industrial sized ones like Scotchman, Dake, Dorrenger, and the likes cut non ferrous fast, and ferrous slow (different saws for each). But I see Dake's saws are only low speed, but they cut both?

It will probably be a while before I can afford any of those though, so in the meanwhile, who likes the Morse Metal Devil vs Dewalt vs Makita? I'm thinking I would get two. One for Alum, the other for steel? Also, it seems like some saws are rated for like 4" square tube, but then say 2.5" square solid max? What's up with that? 

 

Thanks