I have a GoKart, jogging stroller and a backpak.
My home course is rather wooded, so roots make a few holes difficult, but not impossible.
If I want to practice throws with multiples (and I know the course will be empty) I'll take the GoKart, simply becasue I can roll 40+ discs if I choose.
But for normal rounds, I will use my Grip A-series. It actually HELPS keep my old back in shape to bend over, pick up and carry a full backpack of discs.
Who knew?
My favorite is the jogging stoller, but it doesn't have the capacity of the GoKart or the convenience and benefits of the backpack.