Canon 5DIII AF menus

I am headed out tomorrow to shoot some wildlife. It will be in a fairly controlled environment, with the subjects to be anywhere from close to a few hundred feet away, in natural habitat. As far as I know, none of the subjects will be on a fast run, but the do move around, sometimes erractically.

The fastest subjects I have shot for most of my experience are wind blown trees.

In the new AI Servo 1st & 2nd image priority, should I set it for Speed (shoots pretty much whether focused or not - Equal priority - will slow down the shutter actuation, but tries to combine speed with focus) - or Focus which tries for good focus and may slow down the actuation?

I plan on being in AI Servo.
This opportunity comes my way about 1 time per year.
Should I skip AI Servo and the settings and just shoot 1-shoot, since I have little experience and no time to practice?
The weather is going to be on and off Rain, around 70F. We only have a few hours to shoot.
I will be shooting the 5DIII, 24-70, 70-200mii, and I will bring my 1.4 extender & 400mm f/5.6. I will be using my Shoulder bag which I have quick access to and can change lenses without having to put items on the ground.

Any other advice would be very welcome.

Thanks

One of the best explanations I've found about the AF menus on the new 5DIII are in this review in the section specific to AF: http://www.the-digital-picture.com …I-DSLR-Camera-Review.aspx

bsmotril wrote in post #14266378
One of the best explanations I've found about the AF menus on the new 5DIII are in this review in the section specific to AF: http://www.the-digital-picture.com …I-DSLR-Camera-Review.aspx

Didn't see he updated 5D MK III review, thanks for heads up.
Here's another one, straight from the horse mouth.
http://learn.usa.canon​.com …/2012/1dx_guide​book.shtml