Agree that pod systems, the vape fourth generation devices, have confused users by their turnover speed and their incompatibility by design.
Chinese use an obsolete business model which attempt to make gain from both the devices and their consumables, i.e. replacement pods.
This ends up in a market stampede where no planning is possible, both for the users and the manufacturers. Sell what you can today, that tomorrow is another day - seems to be the current underlying philosophy.
Therefore, the smartest thing to do, from an individual point of view, is to wait few months after the introduction of new device, to see if it keeps on the market, and then purchase some of them, with the reasonable certaintity that you will find replacement pods in future.
And devices stays on the market only if they are properly functional. I got a load of Tesla Tpod devices which I can't find spare pods locally anymore, because the device proved problematic - too low power.
Brands like Innokin and Aspire tends to put well designed devices on the market, so they are good to start with. But true innovation is usually with smaller brands so it remain worth to try some more obscure devices.
Sadly, pod system reviews are akin to paid adverts - and they never point out the device weaknesses, so I don't follow them.
But also big brands cannot resist the current market acceptance so they also introduce new devices too frequently, instead of perfecting a chosen model.
In the end, my suggestion is for two devices. The Nautilus AIO and the Innokin Biip. As you can replace coils, and those coils are likely to remain available for reasons outside the pod market, they represent the wisest choice for the time being.
The Innokin is a bit better technically, for that it has three power levels, but it is chunky compared to the AIO.
