Which External Battery Pack Charger is Better?


Aug 22, 2013
I've been looking around for a battery pack with high capacity, but a reasonable price, and I have come across two different ones with basically the same capacity (the extra 600 mAh doesn't make a difference to me) at the same price. THese are both about 15000 mAh at $50, the best deal I could find in terms of mAh per $. The difference in them I think comes in the actual ports and their voltage, which I don't quite understand the advantages/disadvantages of. COuld someone explain?
This one: http://www.amazon.com/dp/B00D5T3QK4/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=2Z3BV26FAYHXD&coliid=I1B1NFJAIALLKB
Or this one: http://www.amazon.com/dp/B00BZDK3XK/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=2Z3BV26FAYHXD&coliid=I32SLRRKVSKLJD
I am going to be using it primarily to charge my Nexus 5 and other smartphones, as well as maybe a tablet here and there.
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