For fantasy and sci fi there is nothing better than : Worlds Without End https://www.worldswithoutend.com/

The site tracks multiple literary awards: https://www.worldswithoutend.com/books.asp

The site tracks books by nominations and awards: https://www.worldswithoutend.com/lists_top_noms.asp

The site tracks top book recommendations by literary critics: https://www.worldswithoutend.com/lists.asp

And finally, most read books. https://www.worldswithoutend.com/lists_top_reads.asp (I hate that most sites don't allow me to sort not by rating, but by votes cast, or by review count)