AH-4 vs ATAS-120 vs Screwdriver
 

Looking for opinions on the performance of these mobile antennas.
I'm planning on going mobile, looking at the FT-100 or IC-706, but
I'd like to go with something designed as a well organized system. So
I could go with the FT-100 / ATAS 120, or the IC-706 / AH-4, or
maybe either one with one of the various screwdrivers. I've heard that
the screwdrivers perform much better than either ATAS or AH-4.
What's your experience? Do the matched systems really work well?
Do you think a screwdriver with external controller or even manual
tuning would be much better? How about guying? I see that most
screwdriver antennas require guying but not the Yaesu or Icom.
Are there any web sites I can go to with real measured data, not
just anecdotal stories?

Thanks for your time!

Dan, W9FCC