What families actually compare in practice is proximity and capacity rather than a ranking: an established area like Nutana or Varsity View has decades of enrolment history at its schools, while a growing area like Brighton or Aspen Ridge is adding school capacity every 2 to 3 years as the population arrives.
Because the two divisions draw separate maps, a family should treat any list of good school neighbourhoods as a starting point and confirm the actual catchment for the specific address under consideration rather than relying on a neighbourhood's general reputation.
Joel Dyck can point you to each division's boundary tool for the addresses you are considering. Get your hand-reviewed valuation from Joel Dyck.