Best way to drive motors to absolute position

[IanLewis42]

• ev3dev version: 1.0.19(0.48/3/2)
• ev3dev-lang-python version: | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
  |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
  ||/ Name Version Architecture Description
  +++-==============-============-============-=================================
  ii micropython-ev 2.1.0 all Python language bindings for ev3d
  ii python3-ev3dev 1.2.0 all Python language bindings for ev3d
  ii python3-ev3dev 2.1.0 all Python language bindings for ev3d

Hi,

I'm trying to drive large EV3 motors to absolute positions. I've been reading the docs here but there seem to be multiple ways to do it.

What is the difference between :
run_to_abs_pos(**kwargs)
and
on_to_position(speed, position, brake=True, block=True)

and how do these relate to the command:
COMMAND_RUN_TO_ABS_POS = 'run-to-abs-pos'

Thanks,

Ian.