Pacers can achieve faster speeds because their
back feet can way-over reach their front feet
without interferance. Check out the top speed
records for trotters and pacers. Pacers have
the edge by more than 10 seconds per mile, I
believe, which translates to more than 2 miles
per hour. I would think this is the driving
cause for preferring pacers.
I read someone mention training natural
trotters to pace using training aids. I
knew a Walker who naturally paced but was
taught to trot as a more comfortable gait
to ride for endurance... lots of years ago.
:) - kat