Sorry, but you don’t know what the series is all about by only playing two of the games.
But coming to mind is the difficulty level. Like I said, im a new FF fan and I sort of want an easyer type FF game to get the overall feel of it.
But you also know what the series is all about.
I think Dawn of Souls is easier than Origins. It has a lot more additional content than the first port, and it also has improved graphics and sound. Not really much difference other than that though.
Also, if you really want to get the feel of it, you need to experience the graphics as they really were. Actually, the drawings in the NES version of monsters are pretty good. Of course, if you don’t feel like extending your FF fandom to the level of beeing psychotic, then you should never, ever, ever, take any of my advice.