Venus II would be fine with a 1.10-1.20 4 stroke. WIth less engine it will not have an unlimited vertical climb.
You will not need unlimited vertical until you get into intermediate, but even in sportsman it will help with
power hungry maneuvers. Also the larger size of the Venus makes it easier to fly and it presents well to
the judges. I have never seen a venus do 3D maneuvers so I can't speak for it's freestyle capablilities.