Because of the low GoodReads rating, I'm attempting to defend "Best SF 73" aka "The 7th Annual Best SF 73" aka "The Year's Best Science Fiction 7". I can see why some may not like this anthology due to the challenging reading experience i.e. not a lot of handholding. It's like Isaac Asimov decides to write in the more highbrow level of new wave scifi or speculative fiction to dress up his golden age SF themes, but with storytelling coming from unusual and off-putting POVs. The hard SF is very much evident in at least half of the entries, and the reader has to put in effort to understand the world building, tone and commentary. This collection is topnotch with great payoff, as well as having a great variety of subgenres, from cyberpunk to crazy alien creatures, from dystopia to science fantasy, from foreign translations to an excerpt of a famous novel, from military space opera to "IDK WTH I'm reading" type of poems (I'm really bad at interpreting them). As you can tell the premises and rich cultural literary history are awesome, but overall there's a reading barrier to overcome. Some faves:
Roller Ball Murder (William Harrison): a surprisingly introspective and melancholic source material for the 1975 movie "Rollerball" about an athlete of an ultraviolent sport
The Wind and the Rain (Robert Silverberg): in the distant future, humankind's destruction of nature is taken very lightly, almost in jest; "Even devastation can be an art form... Perhaps it is one of the greatest of all art forms..."
The Man Who Collected the First of September 1973 (Tor Age Bringsvaerd): a circadian rhythm of 31-hour days prompts a man to become obsessed with one particular day
Captain Nemo's Last Adventure (Josef Nesvadba): pursuit of lofty goals and heroic fame vs domestication from romantic/familial love -- can only choose one or the other
Escape (Ilya Varshavsky): my top fave here; a prisoner's given a chance to avoid a life sentence working in the fields
Early Bird (Theodore R. Cogswell & Theodore L. Thomas): to beat the aliens, one may have to join them in the most 'intimate' way