Define library in this context. Or do the aliens not define it? I'm thinking about unintended consequences, such as the inclusion of digital libraries and software libraries.

Libraries. Quick! Scan all of the books that aren’t in pdf format!!!

Libraries get the nod from me. Knowledge via books is too precious to throw away.

This is one area Utah has perfect, most libraries have a coffee shop inside. Finding a bank with free coffee is difficult but libraries and coffee go together like thinking and atheism.

With libraries we can learn to make new coffee.

I voted for libraries, but am rather fond of both. It seems I am part of a dying breed.

Neither. 'Better to die on your feet than live on your knees!' - The marvelous Mexican revolutionary Emile Zapata

That is the cruelest choice imaginable! Who could possibly live without coffee and libraries? I'll opt for the death ray!

I like coffee, but I'd rather have libraries, given this silly choice. But how would we expect humanity to come to an agreement about such a thing? (And it might be easier to organize coffee speakeasies than library ones )

Reading online or e-books doesn't compare to a real book.
There are thousands of coffee alternatives.

I have never been a drinker of coffe. You do know tea goes along quite well with reading.

I enjoy coffee a few times a year, but books are worlds. I can toss a few smashed beans boiled in water over knowledge, imagination, and inspiration.

Learn to grow another bean with the library books

This is such a hard question for me, but I think I love coffee too much. I have to do away with the libraries.