I think @moistloaf hits the nail on the head with his post, and I really just want to offer a consenting view.
I still think OCTGN is the superior platform for the minute, although Jinteki is getting much better as time goes on, and may surpass OCTGN at some point. I like how something things can be made faster through OCTGN than Jinteki (running a multiple ICE server when you already know the exact cost to get in/know no ICE will be rezzed; Jinteki requires you to go through each ICE individually, OCTGN will let both players agree that the run is successful and then he's in; Personal Workshop on Jinteki requires you to remove each power counter one by one, taking two clicks (on the mouse) each time, which is a huge hassle for something like Torch or Femme, OCTGN lets you remove X at any time with a single click), but overall, these are minor gripes.
At this point, both platforms are excellent at representing the game, and I really can't fault anyone for preferring one over the other; I think it's close enough that using either is totally legitimate, although I also agree with Moistloaf on the "prosumer" "consumer" analogy. But again, I think they're both good enough that it's become a matter of taste.