For Landscape trailers we use Canada Trailers, they are the best made trailers I have seen although pretty expensive, we have a lot of them ranging in size from 6 X 12 to 8 X 19, electric brakes on them all.
Our Cargo trailer is 6 X 12 and made by John Deere, actually they have a place in Florida make them to their specs.
What is the best? Depends on what you are hauling.
Halifax, Nova Scotia