Pancho Gonzalez did deal with peak Laver, Rosewall, Borg, Connors, Kovacs, Riggs, Segura, Hoad, Trabert over of the course of his career. He didn't face Borg and Connors at their best however. The others he met at their peak. Laver, Rosewall, Riggs, Hoad and Trabert had excellent passing shots and Segura's forehand was deadly.
I'm not sure if anyone Edberg faced had the passing shots of Laver. Connors was passed his best when Edberg reached his peak.
I would think either Kramer or Gonzalez because they combined the huge first and second serves plus a top volley.
Frank Sedgman was a great serve and volleyer also as was Tony Roche. Stan Smith at his best for a little while was excellent and also Arthur Ashe, although Ashe could net his forehand volley.
Edit-Edberg faced Lendl, Wilander and Mecir who were super on the return and had super passing shots.