I always thought of the Plus 4 as the sports model and the 4/4 as the car for pottering around in.
Certainly that's how it used to be.
Used to be when?
I don't think Morgan have ever made a car just for "pottering around in", for long periods in the 4/4's illustrious history there hasn't even been a Plus4 model.
I'm with Heinz on this, the agile 4/4 is the Morgan in its purist form. Putting additional power in the more corpulent models does not make them any more of a sports car.
~iw