I used PG's for years they are ok machines if you can fix them yourself..
Got a Z jr36 last spring and after a day of using it wondered why I didn't get one years ago! They are built like a tank, great people to deal with and awesome support. The Z saved me over 100 hrs of work compared to my PG and I used the Z to pull an aerator on about 50 lawns
GMC 2500H, Jr36 & Intermediate Zsprays