The Plus is probably all you will need. The difference between the Plus and the Pro is the number of objects.
I think the Plus has 2.1 million stars and the Pro has 13.2 million - numbers are in that area, go check the SS site out for the exact. Similar for DSO's and other objects. So it really comes down to how many stars and objects you want/need.
I have the Plus on an Android Tablet and it hase everything I need.
Seems at least on mine to have a problem with satellites, if it highlights one and I select information it stops (crash), same if I pick a satellite from Todays Events. Slightly annoying.
As mentioned if you buy one then for the next you buy it all over again.
Plus and Pro both do scope control, the Pro has one feature something to do with viewing the galaxy/universe from other places. Cannot quite see why I would want to see Orion from Capella sort of thing. Perhaps an idea to show someone that the constellations we see are dependant on our present location. But not sure.