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Mainly ask yourself what will draw someone to buy this book. Sometimes it is a famous name, sometimes it is a genre, sometimes it is a theme (first contact, combat with aliens, giant thinking tank...
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Source: https://writers.stackexchange.com/a/44103 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Mainly ask yourself what will draw someone to buy this book. Sometimes it is a famous name, sometimes it is a genre, sometimes it is a theme (first contact, combat with aliens, giant thinking tanks, etc.). There are already many good answers here. I will mention another way to collate the stories. Take a page from music albums. Pick and arrange stories so that they they form an overall narrative (plot or emotional journey). They don't have to be in the same universe or even genre. For example, a story of inner conflict, a story of one-on-one conflict, a story about a small skirmish, a story about a large battle, etc. ending with a story that contemplates conflict. It could also be a journey through emotions or moods.