I have the Kanger sub, and Atlantis v1 & v2.
I'm not a big fan of the Kanger and not overly impressed with the coils for the Atlantis v1.
The Atlantis v1 & v2 tanks will both use the v2 coils which I really like. I prefer the .3 ohm coils in either tank. The v2 has a greater span of air flow.
I found authentic (around $25) and knock offs (under $15) here:
Found 307 Atlantis at FastTech - Worldwide Free Shipping
I haven't ordered from this site yet but I've been eyeballing the Mega since the normal size tanks are a little smaller than I like, for me, the only downside to the Atlantis.
The Freemax Starre tank is 5ml. 2ml more than the Atlantis. The airflow holes on the Starre is absolutely massive, more than enough for anyone. It has two cyclops eye airholes that are 3mm tall and 12mm wide. More than double the size of the largest airflow setting on the Kanger Subtank. And best of all, the Starre can be found for less than $25 for the tank.
The Starre coils cost about $17 for a 5 pack. I've yet to meet anyone who hasn't had a coil last at least a month. Freemax themselves say a coil should last for 60-80 refills (300ml-400ml of juice), which is a huge amount for a single coil in a subohm tank. The coils are rated from 20W up to 100W, so they can accommodate virtually any preference in heat and power.
The only other subohm tanks that I've found that come close to the Starre are the Herakles and the Crown. The Herakles matches the Starre in performance but has a smaller 3ml tank, and the Crown is just a hair behind the Starre and Herakles in flavor, has a smaller 4ml tank, but has top-filling which neither the Starre nor Herakles has. However, later this week the Starre Pro should be hitting store shelves with top-filling and also temperature control coils. The Starre and Crown both have dual parallel wrapped vertical coils, but the Starre coils have a slightly wider range of operation. The Crown also has two single coil options, but IMO they don't work nearly as well as the DVCs.
In short, my list of the 3 best Subohm tanks would be...
1. Freemax Starre
2. Uwell Crown
3. Sense Herakles
And this is a very tight race between them. I rate the Crown over the Herakles simply because of the top-fill and 4ml capacity, and I rate the Starre over both the Crown and Herakles for the 5ml capacity and the price.