Because there are so many different types of reptiles kept as pets, it is hard to make any blanket statements about reptile cages in general. You should know as much as possible about your particular pet of interest, its needs relative to humidity, light, heat and space, and its size as a juvenile as well as an adult before purchasing.
The BioBubble is a very unique and handy terrarium for smaller lizards and snakes. Screen enclosures are safe and convenient with lots of circulation. The wire cages are for larger reptiles. Pay particular attention to the bar spacing if you don't want to find your lizard roaming the house when you get home.
Some cages were developed as non-specific animal cages, bird cages or ferret cages and may take a small amount of adjustment here or there for your reptile pet.