Depends on a few things, the number one consideration is ambient temp in the room where the rack will be kept, if below 75 an enclosed rack will be the best option which means PVC as far as the 3 top companies in my book you have C-Serpents, Animal Plastics and Reptile Basics.
If your room temp is 75 and up you can also consider open racks such as ARS or Freedom breeder, a little pricier but great rack, also I do prefer Freedom Breeder since their racks are stainless still and will not rust over time, (ARS are not and are just powder coated which over the years can chip and rust)
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