I have compared Edge2000 6" DA (quick connect system), Edge Classic 6" DA (velcro system), Lake Country 7.5" Curved Edge, and Lake Country 6" Variable Contact pads. The each have their own sets of pros and cons. All of the pads can be effective if used properly and paired with a compatible compound/polish/sealant/wax. Here are some of my personal (subjective) observations -
E2K DA -
-excellent durafoam materials (very durable foam available in a variety of textures)
-rounded edges allow for fairly smooth transitions over curves and edges
-two usable sides per pad; sides can be manufactured with two different textures of foam
-thick size of pad limits the ability to reach into tight spaces
-solid center plate prohibits wringing out of pad, leads to longer drying times after washing
-quick connect system ensures perfect centering
-no velcro parts to wear out, although there have been reported problems with some of the earlier connector assemblies
-flat face allows for complete contact with surface
Edge Classic DA -
-as with the E2K model, this has the excellent durafoam materials (very durable foam available in a variety of textures.
-velcro backing makes this compatible with other velcro pad systems
-blunt cut edges do not allow for smooth transitions over curves and edges
-blunt cut edges limit the ability to reach into tight spaces
-flat face allows for complete contact with surface
LC Curved Edge -
-contoured surface with beveled edge allows for effortless transition between virtually all body panels
-center depression limits product splatter
-large variety of foam textures available, although the material does not seem to be as durable as the Edge counterparts
-7.5" size allows pads to be easily exchanged between rotary and DA buffers, although a 5" PC counterweight should be replaced with a 6" version for best results
-molded velcro backing is durable and safely encases edge of backing plate
-curved face allows for precise placement angles, but also limits the amount of foam in contact with the surface at any particular time
LC Variable Contact -
-center depression limits product splatter, but also limits the amount of foam in contact with the surface at any particular time
-large variety of foam textures available, although the material does not seem to be as durable as the Edge counterparts
-design is very user friendly for a PC newbie
P.S. I have stated many times that my ideal PC pad would have Edge's durafoam materials combined with the design of the Lake Country 7.5" Curved Edge pad.