Neither. It is derived from the classic maps familiar to Risk players of varying decades. The GC map is not the basis of the Strategy Gamers' original Hex-based world map (TM). While very similar to to the GC map it is only because the GC maps seems to attempt to emulate the traditional Risk maps. Frankly, I like the Strategy Gamers map more, but I'll leave that to the court of public opinion.
Additionally, Strategy Gamers in no way attempts to emulate GC. GC is a fine site to play on for certain types of participants and very limited play options. Strategy Gamers intends to be a superior strategy gaming site (I believe it already is even in pre-beta) with unmatched options, flexibility, and variety. The true goal is to build a solid group of participants in an active gaming environment where good sportsmanship is the standard.