uh... there arent any new rockstars. i dont know if you mean the imperialstars or the newER rockstars but... anyway...The new Rockstars have Superstar shells with Rockstar hardware. The Rockstars are well-built, sound great, and come with a good snare; not that nasty steel junk snare the Visions come with. I can't think of anything that makes the Visions better than the Rockstars, be it the cheap iso mounts and denting tubes or the pointless features like the different shell thicknesses.
The visions do have better shell construction being all birch and the different shell thicknesses actually do serve their purpose well.
Before you ask, yes i have played both. i play a rockstar about every weekday at my school and it sounds like garbage.
The visions sound better than the rockstars but i would take the superstars over both