I may be a bit late to the party here, but I'll give you a few good reasons to choose sub-ohming on a mach over a high powered regulated mod. It's the same argument for revolvers over semi-auto, you know it will work. First off fewer parts means that less can go wrong. The chips that make power regulation possible wear out, they break down over time becoming less and less reliable and eventually stops working. They're smaller and lighter, as in more mobile. They're cheaper, a solid mech clone can be had for less than $50.
so lets recap.
1. more difficult to damage
2. more reliable over time
3. more portable and easier to carry
4. more affordable
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Your honor, I'd like to take issue with number 2 here if I may, ...
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2. more reliable over time
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Over what time scale?
Seems to me, that from the moment you pop a fresh battery in both of them, the performance of the mech begins degrading at the first press of the button, until the battery needs to be recharged. With the regulated Mod, the performance stays the same until it's time to recharge.
What does this mean?
The majority of the time either device is being used, the regulated Mod is more reliable for more of that time. At worst, the only timescale where the Mech should win is the lifetime utility of the device, but since every firing of the mech degrades performance, you have a device that spends less time being reliable, but you get to have it be unreliable for a longer time.