Plush is not a better song than Seven Caged Tigers (let alone ILS or Adhesive).
In your opinion...
Sure, it's all just opinions. But, I really believe that if you did a study today, and took 100 people at random, then played Plush, Seven caged Tigers, Interstate Love Song, and Adhesive, they wouldn't choose Plush. It's all about the best song, and doing an unbiased survey would most likely rank Plush below several other STP songs.
It's kinda like how people say the Ford Model T is the greatest car ever made. Their only claim to that basis is that it's the FIRST of it's kind, but objectively nothing compared to even the worst production cars in the last 50 years. Don't get me wrong, I still love Plush, but sure.... in my opinion.... it's not their best song musically, or lyrically. It's even more dated than a lot of their songs, especially ILS which is one of their most timeless songs, and probably one of the few STP songs that will continue to live on transcending genres for years to come.