On their last big-planet flybys, both Voyager 1 and 2 were given substantial kicks out of the plane of the ecliptic.
If this wasn't so, and their flyby's were adjusted to stay within the plane of the ecliptic, in what ways would the missions have been different to manage, and in what ways would the resulting data have differed?
From How well can Voyager 1 separate Earth signals from Solar noise these days?. Data for the Sun, planets, Pluto, Voyager 1 and Voyager 2, from January 1, 1969 (a good year to start things) until
now July 2016 (dots), but it will look roughly the same now. Data is from NASA JPL Horizons.