I been looking for a pressure washer and came across a pressure washer online when doing a search,its a brand name called Champion,its a 2700psi and says it has a triplex pump. Is that a cat pump or is triplex just a type of pump?

Any thoughts? It cost $399.99, I hear cat pumps are good pumps.

I was also looking at a rigid pressure washer,I think it was 2500psi with a cat pump and subaru engine,cost $550.

I have a big concrete deck around my pool and various other jobs around the house. I narrowed it down to these two.

Thanks for your opinions.