(Ringworlds are somewhat different as their Ring structure gives them a unique ability to produce artificial gravity with nothing more than super strong Material)
Not really. A Dyson sphere (of the solid sort) can produce gravity the same way a ringworld would— by rotation. Of course the gravity would lessen with distance from the equator, but you still have more area than a Niven ring (counting areas of lesser, but acceptable gravity). And a Niven Ring would have (at 1 AU from the star) would have the absurd 3 million times the surface area of earth.
Actually destroying and rebuilding a planet as a halo,
l, could be a reasonably sized step up from planetary population levels.
the Culture's Orbitals are approximately ten million kilometres in circumference and have widths varying between one thousand and six thousand kilometres, giving them a surface area of between 20 and 120 times that of the Earth.
Personally though, i don't like the idea of the ideal end-game being the destruction of all your unique planets— replaced with identical rings.