There is no difference in Image quality.
But there is differences in how well the Autofocus is working, and in how well it fit with the canon bajonett. I recomend to not buy the cheapest, becouse you will quickly experience that you will change how many tubes you use all the time.
I have Kenko and love using them. Autofocus work perfect. I use them with 50mm 1.8 and with a 135L, have also used them on a 28-90mm.
The wider the angle is of the lens, the more tricky it is to focus. On a tele the autofocus works better than on a wideangle. The reason is that the area that is sharp is very narrow. With dof less than an hair, the autofocus is tested on its limit. The other reason is that you loose alot of light with the tubes. With less light, the autofocus get troubles.
If you go realy wide, like 30mm or more, you will not be able to focus at all, since the focus points ends up inside the lens.