What's faster, questions on balance while cruising long distance

[markxengineerin]

On a reach in 10-20 knots, my boat has some weather helm no matter what I do with the main sail.

What's faster, a full size and trimmed main, with lots of rudder correction for the weather helm? Or A 3rd reef in main, letting it luff a bit, and less rudder correction to maintain course?

Another related scenario, what's faster, autopilot steering the boat to a destination compass heading, or letting a windvane (or autopilot in Wind mode) zig zag the course +/- 20 or so degrees as it typically does? No sail adjustments in either case.

I would like to do what's fastest, but don't have the equipment (or consistent wind conditions) enough to figure this out easily on my own. I made a poor effort and could not draw any conclusions either way.

Thanks!

typical chart, wish I had rudder angle on here too, could be added: