Original 10/10 - So many memories of this game. Never owned it until later in life, but I rented it a ton. Started out by getting confused about the stage numbering and skipped the neutral areas in favor of doing area 2 just after 1 (should have read the manual). Took turns with friends trying to do the hardest swing combos and together we slowly reached the final 3 stages, though I ended up beating the game myself from there. The final stage is one of the best on the NES!
I also loved this game enough to speedrun it. I wasn't the best at it, but I could still reach the ending in under 19 minutes.
Rearmed 9/10 - I have this on X360 and really enjoyed it. As people have said, it's a nice remaster that does a lot of things well. I also beat all of the challenge rooms, which while they were not the highlight, they are definitely great extra content for people who like that sort of thing.
Haven't played Rearmed 2 yet, but based on what I've heard, I'm not in a hurry.