If you have dry winters (which I suspect you do) Then go with a rack/tub setup. It will be much easier in the long run. Tanks are heavy, hard to clean, don't maintain temps and humidity well, and generally much bigger then they need to be for a ball python (mainly in height). Tubs make keeping your humidity up very simple. You control the humidity by making holes in the tub. Less holes = higher humidity.
If you are okay with the idea of tubs, go with tubs. If you go with a tank, you will probably end up switching to tubs soon after anyway
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