I have never liked the "show don't tell" arguement. First, if I wanted to be a story shower, I'd write movies. I am a storyteller of the old fashioned kind, a rare find these days.
Second thing: When people have read and critiqued my stories and tried to show me a sentence they said was "tell" and give and example of "show" - the sentences were as different as night and day. Pretty prose - but it did not convey the thoughts or feelings that the reader needed to know. As a reader, they would just skim through with no idea that something important had just happened.
Of course, it may just be my difference of perceptions. I don't read minds, and perfer clear writing that says what it means, and means what it says. Don't leave me guessing, I won't guess.
So in final answer, it depends on your audience, and what you are writing. Are you writing about something medical, fitness, or education? Tell will be far more clear, conscise, and to the point (yes, you can still have fun writing these). Si-fi, fantasy, romance, poetry - leave the reader guessing what you mean all you want - it leaves them with more ownership of the story, though their interpretation may never be yours!
Then again, we may all see "show" and "tell" different as well. What one views as "show", another may think is "tell".