i know next 2 nothing about pendulum, gyro, 'motion sensing' controllers.
only that i prefer NOT to use one.
many folks DO and LIKE them.
i'm spoiled by the itbc used on the fords.
it has worked flawlessly in 70,000+ miles of towing these last 4 years.
and after initial setup, i've only adjusted in twice.
one of those times was to gain MORE trailer breaking on a LONG stretch down,
that had patches of snow and ice from a sudden spring storm at elevation.
once back to normal roadways i dialed the unit back (and only increased it 1/2 point )
i'm not a fan of using exhaust braking in rving EXCEPT for limited situations and EARLY slowing.
i like having 10 brakes working to slow the rig not 4 or just the drivetrain.
my choice from the aftermarket segment would be the BS unit that goes ON the master cylinder...
because it basically works just like the oem ford.
works with antilock brakes, isn't dependent of a gyro and imo hydraulics are very reliable system to provide input to the controller.
the scenario u describe (braking on a curve and being pushed into a bent position) can happen.
it's a scary feeling to be sure.
but in addition to having the correct set up, good brakes and a responsive controller is...
NOT braking in the curves!
i know that can be a challenge and is sometimes IF we brake too late or ENTER a curve with too much speed.
LEARN about the 'friction circle' concept and theory.
here are some starter links but google and get more...
The Pansy Patrol » The Friction Circle
Friction Circle (The Basic Theory)
DAM Driving School Friction Circle Explained...soon
basically ANY given tire has a limited amount of GRIP.
cornering (turning), accelerating and braking are 3 actions that RELY on tire grip.
doing ANY one thing (turning, accelerating, braking) allows ALL grip for that ONE thing...
TRY to do 2 things (turning AND braking) and EACH action has LESS grip.
so the thinking and action steps are...
BREAK before the turn.
TURN before accelerating
ACCELERATE after turning.
and try to NEVER brake and turn, OR accelerate and turn.
YES the combos can be done, IF carefully balanced,
but the FRICTION CIRCLE explains WHY LOSS OF CONTROL happens at those times.
now HOW this applies to trailering is that it is MUCH more stable to brake WELL IN ADVANCE of the turns,
and roll through them (with mild acceleration) without braking.
in also helps drive home the point that WEIGHING the rig is critical,
so that you can confirm proper WEIGHT on the steering AND drive axles.
anyway my vote is for the master cylinder style, controllers.
i'm sure you've checked the TECH sections at BS and their vendors right?