NGCD games are no ports, they all play like the homecart or MVS versions because they run on the same hardware base.
Some of them have missing objects and animations, but the latter only goes for menu anims or stances, never gameplay-related chara anims or something like that.
Some CD games also have extra play modes, that's why for me, stuff like the NGCD version of Neo Turf Masters, Trash Rally or Twinkle Star Sprites are way better than the carts, not to mention the audio tracks you get with most NGCDs that can be played in your standard CD player.
If you can stand the load times (newer games like the LBs or later KoFs are nothing for the impatient), a NGCD/CDZ will give you as much fun as any other Neo variant, at least it does for me since the mid-90s. I also have a homecart system but if I had to chose between the two, I'd take the NGCD and never looked back.