Bro. Depends on how much power you want and how much weight you are okay to carry around. I myself ordered astro3 2nd gen. 12000mah. It's 300 grams. I am okay with them. If you want something light then I will suggest astro Slim3 which 155grams and is 6000mah.

Better ask Ismartpower. He can explain u better

Highly recommended seller Gave me a birthday gift as well! sweet of him. And loves to reply all ur queries, somemore is more impatient then me asking you got ur post yet hahaha. In short dont even think once if u wanna deal with whtever he sells... as for the anker powerbank lets see how it treats me, but of as wht i have read n heard, Anker is one of the best reasonable GOOD powerbank brand with other promising products too!

Oh and did I tell u that astro3 2nd Gen doesnt feels cheap at all

anyway wont be surprised if he is out of stock again If you know what I mean, order soon before all models are sold out again lol.