Question [Q] Best dual car charger?

Anyone have advice on a dual fast-charging car charger?

One of the USB ports will be plugged into my iBolt Car Dock w/ my Galaxy S3 and the other for various other devices (Kindle Paperwhite, iPad Mini, Kindle Fire, Galaxy S4, etc. - family devices). I'm guessing to take advantage of higher powered chargers, I would need to enable "fast charge" the Android devices, otherwise they'll probably just see it as a data USB connection.

I found these two on Amazon. Anyone have experience with them?

Scosche USBC202M Dual 10 Watt (2.1A) USB Car Charger works with iPhone 5, 5S and 5C
http://www.amazon.com/Scosche-USBC20..._cd_ql_qh_dp_t

Griffin GC23139 PowerJolt Dual for iPad, iPhone, iPod
http://www.amazon.com/dp/B005BD2NE2/...I2QBD3Q2HP7ENN
Sent from my SCH-I535