Atlas, but never put anything over double the thickness of the setting through the machine. You'll ruin a machine in no time.
Slice your clay in slices slightly over the largest setting on your pasta machine and then the next time put two of those thicknesses through. Be kind to your machine and it will last years!
I have tried all different types of pasta machines(most likely all of the different machines, except the commercial ones), I even own a Dream Machine and a Trattoria (I know I spelled that wrong). I still love my Atlas the best! I bet I have over 20 machines, since I pick them up at thrift stores when I see them. The old Atlas machines are usually better and don't have the plastic scraper blades.
Also, save your old machines for parts.