I am not an e-cig collector. I wanted a device that would vape at 6 volts. After careful consideration of the devices available or soon to be available, I chose the Super-T for several reasons. First, it was the first device to include venting airholes in the body, adjustable airflow (for the 801 atomizer), adjustable button throw/pressure and locking button. These are all safety and design features that are both convenient and, well, make the unit very safe and pleasurable to operate. Second, the design is very beautiful. Third, the device is hand-made by one person. This insures that you get a product that meets the stringent scrutiny of the fellow producing them. Third, I feel very confident with the customer service provided by Super-T manufacturing. Emails and PMs are answered promptly and corrective actions, while not usually needed, are super fast. Finally, the device is 100% mechanical. This means it will continure to operate long after I have croaked, but it is easy to diagnose and correct minor problems (of which I have had very few).
Honestly, there are several high-end battery packs out there. You would likely be very happy with any of them. But using the same atomizer and same voltage, any of them should operate similarly. You would have to base your purchase decision on design and safety elements, ergonomics, style, flexibility (i.e. voltages it can run at), customer service and perceived value.
