I'm guessing you don't own birds. Bc of what you called these things. Please don't leave dowl perches in your birds cage and replace the with natural wood
All birds need more room then the 2nd one. The plastic one is sh!t. The 3rd one is perfect for budgies to small conures and loris! The rot iron one is perfect for small conures and loris! The number q on the list is only big enough for tiels, small conures, budgies and monk parakeets.
30" length is always too short in any recommendations yet the manufacturers that make the cages do not make them of reasonable length. There isn't one cage listed here that is big enough to allow zebra finches horizontal space.....
Kinda boring... you should always try to avoid sounding like a robot. Also you didn't add anything related to price, or at least I missed it if you did mention pricing.