It is sort of a tough decision for me. I first saw TOS at 15 in 1966. I knew about old style effects like miniatures and wires from the Lydecker Brothers work on Republic serials of the 1940s. But I could not figure out how Star Trek did the space scenes, because the Enterprise wasn't on wires, and wasn't a cartoon. So I started to read about optical printers, blue screen photography, and would pick up American Cinematographer magazine if I saw it. So those original effects are an important landmark for me.
Contrariwise, I have a 3d Enterprise in my animation program, and I have used it a few times just to try closer angles than the series could.