Top 100 all-time as rated on RYM and PA

Precisely because a lot of votes come from teenagers, this list counts nothing to me. If you look at the ratings of Pink Floyd's records in the top 10 you see that they are about DOUBLE than those of the other albums present (apart from In the Court of ...), What does it mean? That The Dark Side of the Moon is a status symbol, everyone knows him, and therefore if someone passes by RYM he gives him 5 stars, especially if he knows not too much music and not too prog. My friends who are Tool fans would never dream of commenting a prog chart where Tool comes before Van der Graaf (also because they don't consider Tool music as prog).

My list can be judged as you want, but what matters is the seriousness and the criterion, not the tastes, and from this point of view, mine is a serious list because made to be a ranking, the RYM ranking is simply a random list due to the collection of votes from anonymous people (I can't take it seriously, it mostly depends on the popularity of the artists and from the tastes of those who follow RYM).

What I find difficult to explain is 

@Grumpyprogfan

that my criterion for distinguishing serious rankings, that is done with method, and non-serious rankings, has (almost) nothing to do with my tastes.

I try to give an example: in my ranking, divided into three blocks, the most popular bands are

King Crimson, Pink Floyd and Van der Graaf (5 albums in total: 1 + 2 + 2). Genesis and Yes have 4 albums, but only one in the second block (1 + 1 + 2), EL & P are the most snubbed, with only 1 album in the last block.

If a reviewer made a list by reversing the positions of EL & P, Yes and Genesis with KC, PF, VdGG, leaving the VdGGs only 1 album in the third block (as I did with EL & P), I would consider his list serious.

I would notice that we have different critical evaluations, me with higher marks towards the eclectic prog and psychedelia, he towards the symphonic prog with music made with virtuosity.

In short, it takes method, and there are some stakes not to be overcome.

In my opinion, if a prog list puts Tool and Rush and Opeth 

(or Il Bacio della Medusa, La Coscienza di Zeno, La Maschera di Cera, to say three highly rated recent Italian groups) 

before KC or PF or VdGG or Genesis or Yes (with EL&P there would already be discussion) it got no value.

Camille Saint Saens was a musical genius, I read that he had an ease in writing clear melodies comparable to that of WA Mozart, but no music critic dreams of putting the genius of Saint Saens before that of Mozart.