In my opinion, Star Trek TOS is the absolute best Star Trek there is. Period. End of story. Where the Next Generation was all prim and proper, Kirk and crew actually had guts and a cowboy attitude, with space being the old west. Aside from that, everything cool about Trek came from the TOS. Phasers, tricorders, and all kinds of other amazing props. One of the best props is seen in several episodes and that is the Star Trek Tridimensional Chess Set.