Years ago, I did most of my training for the rating on an Aztruck and then switched to the Partenavia (can't quite recall what the reason was).
However, the Partenavia was a delight to handfly and a breeze to operate for the test.
The DCA examiner was well known to me and gave me a good working over - all good fun - I think the autopilot "failed" shortly after the first takeoff.
Suggest you do the rating test on the Partenavia and then worry about fancier machines in which the throttles have some relationship to the airspeed and the wheels go up and down.