Everyone has opinions, some just use damage spreadsheets, some incorporate dodging, some add meta game matchups.
They should be used as references and you should form your own opinion. I personally don't care for the damage based lists that ignore types. Gamepress puts the most thought into their list. Even if players like to disagree with the tiers on the q&a.
As for the comment on alakazam and gengar, I believe that comment has many downvotes. Including mine.