In total, as of right now, I own 4 power banks. They are all Anker too. My first power bank was the Anker PowerCore 13000 which I bought to keep my phone charged while playing Pokémon Go. It would last the whole day even though the battery on my phone was crap. Later, I got the PowerCore 5000 as a thank you gift from Anker, which I actually loved since it was smaller and lighter to carry when I didn’t need too much power. I also have the PowerCore 15600 for when I take trips, since it can last me a few days. I recently bought the PowerCore Lite 10000 as well, just because it is slimmer as well as lighter to stay in my pocket & has a good amount of power.
I would say of all of these, the ones I would have to say are my favorite to carry are the PowerCore 13000 or PowerCore Lite 10000 due to the weight and the good amount of power they both hold, not too little power and not too heavy. I have also gifted 1 PowerCore 5000, a PowerCore 13000, & bought a Blackweb one for a gift exchange.