FYI, my personal preference for my snakes (mostly colubrids) is glass tanks...but in the past, I did try a matched pair of plastic cages, & they were HDPE, not PVC.

I made that choice primarily for health reasons...all plastic off-gasses toxic stuff when it's heated, & HDPE seemed somewhat safer, though consider that frozen foods
that are designed to be heated & eaten from HDPE containers ALL say "do not re-heat them", because then they break down to some extent. So how significant the
difference is long-term, I'm not sure. I will say I think that either PVC or HDPE cages are preferable to using plastic storage containers, since they even reek at room
temperatures & weren't designed to be heated at all, much less occupied by living creatures.

FYI- the HDPE enclosures that I had did a little warping on the bottom from the well-regulated UTH, & FYI, some urates still managed to bond with the surfaces. I'd
still say that HDPE is the better choice of the two, but I really don't care for any plastic cages, so I might be the wrong one to ask. All plastics scratch easily, even from
paper towels, & those tiny scratches can trap nasty germs. I'll admit tanks take up more room (don't "stack") and they're heavy, but I love that they're inert & smooth,
I've never broken one (I prefer actual aquariums to the thinner glass used in "terrariums"), & I love the visibility (which is easy enough to modify for privacy, scenery,
and/or insulation as needed).

I'm sure I'm in the minority on this issue anyway, lol.