Are you sure Top Fin is actually a manufacturer? From what I've seen at Petsmart, a lot of the Top Fin products are made by other brands and repackaged under the Top Fin name. I always thought the aquariums were made by Petfecto and relabeled.
RTR that's likely because of a lack of experience. I can't really say if All-glass is the best, but it has worked well for me in the years I've had it. What benefit do you see with the Oceanic over All Glass?
What's the difference between a Ford and a Mercedes? Better, heavier materials, much more stringent quality controls, last forever - but they still scratch like any other tank.
Joe, my guess would be that there are a lot of folks here with only one tank rather than multiple, who like superjohnny in this thread have no basis for comparison.