In my opinion there are no best and worse. All depends on where you get them.
With clones, i found that if you get a good one, it will be really good and will serve just as good as an original. But if you get a bad one then you have problems every other day and end up replacing parts, reflashing etc.
Dreamboxes are pretty easy to set up tho and you will get a lot of help from members here.
But in saying that im not saying that other boxes are bad as i have not tried them so ask around in other sections you might get an easier option.