Wicked is more feature oriented with big production pictures and hot Contract girls. Maybe at a higher standard than Vivid, but like Vivid, can be boring at times.
Digital Playground produces the perfect mix between feature films and gonzo films. They make gonzo with an actual plot. The girls are hot, the production values are top of the line, the plots keep you entertained, and Robby D. may be one of the most underrated directors in porn. Jack's Playground is one of the best lines out there.
My vote = Digital Playground