Repatriums are great for most uses. I find that large ale veileds like to be able to see more. Reptariums make them feel confined, and they tend to be slightly more stressed as opposed to a screen cage. for montanes, and female veileds, reptariums seem to provide BETTER comfort for the animals. Many of these animals stress when out in the open, and reptariums simulate the dense foliage they seek out.
They're much easier to move around and transport than screen scages. I also find them to be easier on claws than screen - while they catch claws worse than screen, they give - screen doesn't. I've not seen an animal with claws damaged from a reptarium, but I've seen plenty of screen damaged claws.
Overall, I much prefer screen cages, as they look a lot nicer. But some situations (temp cages for rearing young, outdoor cages for some animals, transportable cages for shows/talks, etc.) reptariums are better.
If I were to be getting a cage to use as a display cage for my animals, I'd go for screen, hands down. Especially if it was a big male panther or veiled.
But reptariums are just fine, and have their uses. i like the smaller ones - the 38's are great for sub adult animals & holdbacks. When I sold them, I put the cage aside.