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Subjective, but I'd go for the brando one. I seldom need my phone charged up the whole way when the battery craps out... just so that I can use it for the remainder of the day.
 
The Morphie is really nice, looks good and doesn't look like it adds a ton of bulk.
 
Anyone know if the Mophie fits over existing (tight silicon) cases? It might be a pain to remove and reattach your regular case all the time...
 
$99?!? I'd go the cheapest route unless you're constantly running out of battery power.
 
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