Mine is my main anchor point for anything Major. Index finger for minor. Pinky is secondary for both. I hope that makes sense.

I have gotten a little too used to it though, because there are times when I should start from the pinky to optimize "finger per fret." For instance when playing I,m3,M3,5,etc. together in an arpeggio, I should start with the pinky on the 1 & play it 4 per fret, but I seem to have developed the lazy habit of starting from the middle finger & incorporating a 1/2 step shift for the threes(min & Maj), & it doesn't always fit the song.