They are both similar (flexwatt and zoomed). I have had up and down experiences with heat cable, but that was before I knew how to use it (also had a defective one). The deal with the heat cable is it takes a lot more time to heat up and stabilize but once it does its pretty good. Flexwatt for APs is not a great idea because they are so thick and solid. Go with the heat cable and a good tstat.