I have the p70Rs with rotary knob.
Of course the rotary knob is useful, and only works on auto heading (it can be used as a direct rudder
control which I never use).
It's easy to mentally count the clicks/degrees when you rotate the knob and the course selected is shown digitally on the display - and all other displays depending on how you set the other displays up.
ES and Axiom Multi Function Displays have a sidebar on the chart page with pilot control (swipe right on the left of the screen)
When on auto heading this MFD pilot control sidebar has the same buttons as the p70 - plus/minus 1degree or plus/minus 10degree.
It's personal preference but if the MFD is within reach you can have the 1 and 10 degree buttons available as well as the rotary switch.
Best of luck deciding but what is clear to me is Raymarine give so many options that there is always a way to configure the set up to do what works for you.
Enjoy your final decision as it'll work
whichever you decide.