Do you have opinions about which brand of sprayer currently has better transom dynamics, boom wing stability and mechanical linkages to make boom height controllers work well? I'm primariliy interested in current Case vs Deere sprayers if you have an opinion.

This is key. If you have hydrualics that can move the boom fast enough to keep it out of the ground in a reactionary environment rather than an anticipatory environment I would imagine the booms would be subjected to tremendous forces just to make them move fast enough to not hit the ground going over terraces at 15 miles an hour. The forces imposed upon the boom by the hydraulics alone would likely break current boom designs. I really believe that if you want to go over terraces at 15 mph and have any sort of luck, you need decent hydraulics and a good operator controlling the booms. Because of that, I would certainly choose auto-steer over automatic boom height control every time so that I can concentrate on keeping the booms out of the dirt. The caveat is that I have never run boom height control so I may well change my mind after running it. I've just talked to lots of people and read lots of things that lead me to believe boom height control probably can't do what I want it to do.