I like the 1.8 NA the best, followed by the nc, then the NB.
For me the NA feels and looks the most timeless. It is also the most humble of the bunch. It isn't trying to look tough or imposing. I also love the hood, it is both very short but long at the same time.
The NC is a great car. It is comfortable for a man my size and it still has the spirit and feel of the original.
The NB is to the NA what the N64 was to the SNES. The snes was the pinnacle of 2d gaming. It was bright, colorful and timeless. The N64 was neat when it came out, but as time passed I felt like it was caught in the weird part of a transition for the industry. Still a great car though.