After further thought I do want to either bury the post in the concrete or at least have it laid flat on the surface.
In this case how can we retard the rot? Some recommendations I have seen include:
placing six inches of gravel at the bottom of the post hole before pouring the concrete. Allows seepage of water How to Protect a Wooden Post from Rotting in the Ground

further treating the lumber
Using a
sonatubeand raising the footing several inches above grade. I am going to use an 8-inch diameter tube and do a 1620 inch pour: 34 inches above grade and 1316 inches below.
Older Answer
This is only a qualitative answer but I'm likely to go with it. I'm fairly convinced by this J-Bolt for which the J provides significant additional shear strength.
Taken from this video: Options for Fastening Deck Posts to Footings




