rothenburger rachet cutter, brand new, overpriced and useless, the cheap screw fix model was better but now got the plasticut set fm rottenburger, great on 15/22mm ok on 1/14/ and 11/2 inch wastes
Reed ratchet cutter. They are really all about the same but a tip I would give you is to really sharpen up the blade when you first use it (watch your fingers when using it thereafter) and it will slice through barrier pipe like butter.
You will need to resharpen the blade fairly regularly as barrier pipe tends to blunt it quickly.
If the ratchets stop engaging properly all it needs is a bit of WD40