I don't necessarily have every product listed, its as I spot them consider them. I bought the Powercore 10000 as its a dense/weight is excellent, if I need more capacity I use two of them (better than one bigger), and the Powercore+ mini for really small carrying days (although since then I moved to a mobile with replaceable battery which is even smaller). I got the Powercore 26800 cheap in that 50% discount code offer.
Personally, i'm not wanting speed of output charge or ports because I personally would prefer to carry 2 Powercore 10000 than 1 PowercoreII 20000, because I get the same combined input charge and 2 ports out is fine for me and its a lot harder to have 2 items fail than 1 item fail. This angst on bigger batteries is illogical, if you carrying that capacity it is because you NEED it, and if you NEED it why put all your eggs into one basket. I do a lot of backpacking type trips and weight/volume are my particular focus. If I'm happen to be indoors (say a pub) I'm more keen to make fast use of the mains power (so speed of ingest matters most to me) than speed of output (as the battery is with me all the time so do I need a faster output?).
I don't have any QC items, and they tend to cost more.