Myers pumps? Rustler or Predator, what is the difference between the two?

Hi all,
I am looking at these pumps, what is the difference between the two models? They look to be roughly the same price and specs....

Thanks,
Rob

As I recall, one has a poly outlet and the other has a stainless steel outlet head and check valve. I have older rustlers with cast iron outlet heads. They both likely do the same job for the same amount of life span. Go to the Myers site and see the PDF files on the pumps specs..