I got Rhythm Heaven Fever for the Wii when it first came out and just couldn't get it. I mean, I understood what I was supposed to be doing, but I could barely pass any of the songs. I figured I just didn't have any rhythm and put it on the shelf.
Fast-forward to 2020 when I was rearranging some stuff and came across Rhythm Heaven Fever again. I hooked my Wii back up for shits and giggles and started playing and was doing great. Either I had magically gained a sense of rhythm or (most likely) the TV I had been playing on when I first got the game had some sort of latency issue.
Now I've gone through all the Rhythm Heaven games, but Fever is still my hands-down favorite. I put a copy on my Steam Deck and sometimes I just load it up and play through some songs when I have a few minutes to kill.
The fact that Fever is your favorite tells me you are a person with good taste. That was the one that really had the best balance of difficulty and novelty. Plus, Remix 9 in that game is probably the best song across the series