I've been using AB for about 3 months now with 4 cards and I like it. It allows me to overclock, monitor temps, and set a fixed fan speed.
AB
PROS-
nice GUI
![Cheesy](https://bitcointalk.org/Smileys/default/cheesy.gif)
can save profiles
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
monitor temps in system tray or task bar (whatever thats called)
![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
make custom fan speeds
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
CONS-
can't OC more than Trixx
![Angry](https://bitcointalk.org/Smileys/default/angry.gif)
takes longer to switch between cards
I've used Trixx for about 2 days and it seems to do everything AB does with a little extra.
PROS-
same as AB (except monitor temps outside or program)
![Undecided](https://bitcointalk.org/Smileys/default/undecided.gif)
can over clock some cards MORE than in AB, for example.
![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
(5850 in AB can only OC to Core:749MHz or so in TriXX: Core:1000MHz) what's up with that?
allows me to change VDDC? whatever that is. (haven't used it)
![Huh](https://bitcointalk.org/Smileys/default/huh.gif)
Allow more custom fan options.
![Cheesy](https://bitcointalk.org/Smileys/default/cheesy.gif)
cleaner and easier interface
![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
drop down in main window to switch between cards!!
CONS-
doesn't have option to monitor temps in the task bar only in the program interface (that I know of)
that's about it.
What do YOU miners prefer AB or Trixx???
![Huh](https://bitcointalk.org/Smileys/default/huh.gif)