Which Portable Power Supply would you recommend?

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http://androidforums.com – Amazon.com: Anker® Astro 5600mAh Portable Power Bank Pack Backup External Battery Charger with built-in Flashlight for iPhone 5, 4S, 4, iPad Mini, iPods; Samsung Galaxy S4, S3, S2, Note 2; HTC One, EVO, Thunderbolt, Incredible, Droid DNA; Motorola AT Amazon.com: Photive 8400mAh Portable Backup Battery Charger Power Bank. 5 V / 3.7a Dual USB outputs for simultaneous device charging. Mobile Power Source for Smart Phones and Digital Devices: Cell Phones & Accessories (General)