I have first hand experience with Heat Shield products, but not those two. What I use is great material so I feel 100% confident in anything they make. (I have had ThermoTec products fail).
I use the
HP Armor on my headers, starter and transmission cable, based on their recommendation for my dilemma (tight clearance with a Hemi and custom tubes). They told me it was their highest rated material. It is fantastic to work with and has lived up to their claim. Their help on the phone was excellent also. I think you should call them for advice.
Here is the weird part: you can't find the HP Armor on their website, but it is available here (with description and data):
http://www.verociousmotorsports.com/Shop-by-Brand/Heatshield-Shields-and-Jackets/Heatshield-HP-ArmorI can say that it is the best product I have ever used, for any project, period.