I'm currently re-reading all the storygames on the site (because aside from very recently I haven't read many storygames since about 2008 or 2009) so I can't give you a definitive answer but definitely EndMaster, and from memory I really enjoy reading tsmpaul, madglee, and JJJ's later stuff (especially a story that he never published called Tristan).
Moved this to the Parlor Room for you, as it's got to do with the storygames on this site.
Why did he ask the question twice?
How to choose? There's so many! BerkaZerka, Endmaster, Sethaniel, SindriVi, Gmmcghee and Aman's mustache ^_^
Yeah, my mustache is the author of every random game on the site. It's planning to flood the site with such bad writing, they would have to worship him.