Duotrope or Writer’s Market?

When searching for markets for your writing pieces, which of these listings do you prefer?  Is one more user-friendly or  has offered you resources where you’ve found more success?

I have more experience with Writer’s Market, but Duotrope has come highly recommended as well.

Currently, I am searching for markets for literary short fiction/flash fiction.

Please share your thoughts/ideas!

Happy Weekend Write-off!