Subarashiki Hibi ~Furenzoku Sonzai~ is the 'best' Visual Novel I've played, as well as it is my favorite work of fiction in all of Japanese media. This is a story that I'm mainly personally attached to, since at the time of my reading it (this was my 6th VN), the resulting paradigm shift helped me out spiritually-wise, pulling me out of my seemingly perpetual comfort zone and allowing me to take control from there. Aside from the personal reason, SubaHibi has an inherent trait of ingenuity with its seamless blending of an abstract ideology into a narrative structure, meaning the story will end up being seen differently by different people yet the ingenuity shown from it stays the same. Due to my mindset at the time, I approached the story as a 'puzzle' as I had with everything else, so I ended up greatly appreciating the intricacy of the plot and its various connections to the theme presented. With that I suspect people who approach the story the same way will enjoy it just as much.
TL;DR: I love SubaHibi like I love my favorite stuffed animal and icecream.