So Alien vs Evic vs eLeaf all dual it seems there Alien is the most popular. Marketing or quality ? They are all in the same price range.
The Alien is the new kid on the block..it's sleak, looks good and just all around appeal. Before that one, it was something else such as the Wismec Reuleaux serie, before that it was the Eleaf Pico, and so on. While the most popular mod might be popular, it's not a reflexion of it's quality.. just that because they are new, the potential "bugs" aren't showing just yet. The Pico has been extremely solid while the Reuleaux serie, which has been extremely popular despite being plagued with bad contacts and other issues (I still am amused to see many that ranted so much about theirs only to end up posting about question on how to fix it, or just end up selling/trading it). The Alien, has had issues with the paint in the first few batches, but appears to be a solid mod at this point.
Somehow, some mods simply flood the market and becomes the "must have" for many... and lots of just as good or better mods end up overlooked... some like the Sigelei 213 which sold fairly well, but quality control and other issues ended up killing its popularity, while some like the Reuleaux RX75, that might have been a winning mod, stalled completely and simply never was a popular one.
One thing that affects the sales is that some models are voluntarily pushed by the makers (cheap to mass produce them) and stores (high markup so more profitable than a less popular model), and until bugs comes out, they are ranted on enough to "catch on".
Then there's the new "must have" mods with new options with touch screens, 20 types of TC approaches and other features, etc. that they are now adding because the basics aren't going to sell, even though these feature don't really do anything "must have" beyond the basics that one can vape just fine with.
I'm going on a bit of a rant here...
But note that it's the same with tanks.. I see people rant about some tanks that I find mediocre, or made to appeal to the wannabees cloud chaser. Then it's the rants about the expensive replacement pre-made coils, how short the lives of these coils are..etc..
And for both mods and tanks, the fad passes and the same people must have to next "best" thing.
It amuses me to hear the wannabees rant on and on (with every new tank or mod they get) about "OOOOOoooooo "flavour" is so much more amazing!!! " etc. when you look at this "new best thing" they have and it's the exact same as the last 5 they've had, just different look. In all my tanks, the only real difference will be chimney length/diameter, and airflow. But when the basics of a RTA/RDA when the deck (according to size (22 to 25mm for example)) will be near identical, the coils (using identical coils from tank to tank), the wicking (which simply needs to be done right to prevent dry-hits) will tend to be virtually identical, I see it as a Pavlovian response, and even a show to prevent buyer's remorse. The best way to know when I'm dealing with a noob, is that he's argue really hard on how amazingly different his new tank is and that he "now" tastes flavours "amazingly!".
Seriously, it's math and physics here... it's liquid being heated up to the point of evaporation, there isn't any magic in how a mod with heat a coil up so differently of another, either it works, possibly works a bit better or just works well", does TC correctly or differently from another mod with a different chipset, while for the tanks, it's a simple principle.... coil heats up, wick pulls in liquid, airflow to suck this vapour up. You can have a tank that will do vortexes and every other approach anyone can come up with.. it's still the exact some vapour than a 5$ tank will produce, that your one year old mod will do. In all my tanks, the only real difference is that some decks are easier to build on, some are easier to wick, but mostly, it's the airflow that I feel makes a difference... not in actual "flavour", but in amount of air going through. I'm at the point where it's more about how one builds that can make a true difference, the number of wraps used, etc. and not the tank itself if it's a decent tank.
Sorry for the rant, but I find it ridiculous lately how some go on that there's a huge science between these things, when the principles are the exact same for all of it, just to be "smart" sounding, and the moment I see anyone go "wow Flavour!!!" I just want to start slapping.