Well, isn't that a bit of a redundant question? I thought they're rated the same mAh.
I have the 10400mAh (5200mAh and and 7800mAh too), can't complain, if you need more power go for the latter, and both are Sailing.
The latter might be big though! Like huge...
Sailing 4 is 10400mAh ans Sailing 5 is 13000mAh - or am I missing something?
Just want something that will work and be able to charge the 2 devices without dying after 5 minutes.