I have a Sears dolly that I bought in '74 for an art show. The handle comes out and with the cart laying flat, the handle fits back into two other holes for a four wheel cart.
It has been the best cart I've ever had. I also have a Harbor Freight one that is much lighter. I use it for lighter pots when I think about it.
I also have a steel mesh panel wagon that I use to carry bags of fertilizer and plant flats to the backyard. I bought it at Sam's years ago. It's only in the last year that the tires are sometimes flat. My neighbors frequently borrow it ( I named it Elizabeth and it has it's own license plate). I will get an email saying, "Elizabeth is visiting our house." I can line the wagon with plastic and haul compost around the yard. I fill it with smaller potsin spring to move them around the garden.
I guess it comes down to personal preference. Possibly buying just one of the dollys you are looking at, instead of several. See if it really works for you. There's always another coupon coming from HF if it works for you.
