In my opinion ABS is much better material. The panel board says its water proof but.... It always seems to warp after a few years. There is a reason they don't use it in new cars any more.
Where are you located? There has to be a place to source ABS sheet locally. I made a video about finding an ABS supplier here.
Also something to note. A lot of people say PVC foam board works great for door panels. You can buy this at home depot. I have not tested it out yet but a lot of people like it.
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