I love my LG He4's and Samsung 25r's. Their legitimate 20 amp continuous batteries and even put out more when I tell them to. Their both 2500 mah as well. I use them in my mech and regulated mods. If I super sub-ohmed I would use HB6's, but I dont normally go lower than .1 ohms and when I do I run it on a dual 18650 regulated mod.
It really depends on what you vape at. Such as whether or not your using a dual battery mod and what your ohms are at. You should be able to use an LG HG2 or Samsung 30Q if you dont draw too many amps, and you will see greater battery life because of the 3000mah. It all depends on your build and device.