I've always used my index and third fingers for this sort of stuff. I don't barre with my Pinky - It hurts like hell across the joint... I can do it quickly, but I couldn't hold it for chords for long....

I do the same thing for full major chords rooted on the A string.... I can flat out across the 3 strings, but till leave the E open.

There's more strength in your third finger than your pinky, so if you want a recommendation, that's mine... :D