Harang has a better K ratio, 8.5 to 7.2.
Their walks are almost even Arroyo with a slight lead 2.4 to 2.5.
Arroyo gives up about a third of a HR more per nine.
THose are the only 3 metrics that matter and are controllable by the pitcher.
If you like to stick with what happened so much, last year Majewski was one of baseball's best set up men. And Cormier, with the Phillies, was lights out.