The ABS version doesn’t warp. I’ve had one in my Duster for a few years now, it gets parked outside in sunlight in temperatures that have hit 109*F outside and I haven’t had any issues with the ABS warping.
If you do get an ABS one, get one that’s uncovered. They do require some trimming to fit right, which is hard if they’re already covered, and I did have issues with the fabric covering separating from the ABS in the heat. I re-glued it with a heavy duty 3M adhesive and haven’t had issues since, but I basically had to recover it myself so there wasn’t much point to spending the extra money on a covered version.