Depends which route you want to go, having been doing this for over a decade I can tell you that PVC racks are not cheap nor do they get easily knocked over like mentioned by some, it depends on where you get your rack and the type of rack you get, I can stand on mine and lean on mine very easily.
What will and should motivate your decision is
Ambient temp and whether you need or want something open or enclosed, in a cooler room enclosed racks are a must.
Top manufacturer when it comes to metal racks
ARS and Freedom breeder, the advantage of Freedom breeder they are stainless steel and will never rust, I ihave seen the effect of 15 to 20 years of wear on powder coated racks (like ARS and the old freedom breeder racks), and it's not pretty they will rust.
Top PVC racks
C-Cerpents , Reptile Basics, Animal Plastics
They have solid product, the only downside is AP has a slow lead time, however if in a hurry C-Serpent and Reptile Basics have a pretty fast lead time.
Ultimately you have to find what works for you, if you can and there is a show nearby where those racks manufacturers are check their rack in person, I know in my case it sealed the deal after deciding which would be more appropriate based on my setup.
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