I havent owned a fd, but did have a fairly modified fc as a daily
Dont believe the bullshit you hear about them needing a rebuild every 6 months. Mine did 200,000ks before it even needed a rebuild, and it was done only as a precaution. Fuel is a killer with rotaries, they use much more than a skyline. They are a great looking car, easy to get power out of, and much cheaper to rebuild - i bought a block package for around 3k - ported, hurley seals - just needed the bolt ons and it could have easy gone to 500kw. They are a true enthusiasts car, and need to be looked after
Ive had my r33 gtst for 6 months now and again, its not the same but i think its quite a good daily driver, much better than the fc was. Fuel consumption is much less, its very comfortable, roomier and modern inside, also easy to get power out of, but more expensive to rebuild than a rotary.
I reckon test drive both and then you will decide which one is best