I use AP, I chose AP because their cages that I got were the cheapest (the T8 $150 + shipping & any accessories) their cages are made from 1/2" thick PVC and are super strong (a few full grown men could stand on top of one). It being made of 1/2" thick PVC also makes it hold in heat and humidity very well.
AP cages are designed to work with flexwatt and stack very well (they even have pins to keep your stack aligned and safe)
Ap cages have slots routed into the bottom for your thermostat probe, and that was a major selling point for me.
Vision cages are 1 solid piece of plastic and are nowhere near as strong. I think that they don't look anywhere near as good as AP cages do. I'm also not a fan of the recessed heat lamp/floressent grates, they limit you to a certain heating/lighting configuration.
Overall I'd give AP cages 10 out of 10 and vision 7 out of 10
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