any thoughts about Joyetech CuBox 50W AIO kit, will this better than Joyetech D22
About the same thing from what I can determine. I doubt a 2000mah battery will last you all day using sub-ohm coils (which really drain battery power). It is not variable power, it is a fixed output device. You won't be able to adjust the vapor like you could with a variable wattage mod. For example, I like a cooler vape (30 watts) earlier in the day, and later in the day I like a warmer vape (40 watts). I couldn't do that with a fixed wattage setup.
Personally, I'd suggest a variable power (regulated) device that uses external (removable) batteries. With the devices you are considering, once the battery is drained you can't continue vaping until the internal battery is charged again. That could be 3 - 4 hours or more.
If you go with a variable power regulated mod, it doesn't matter if you use standard or sub-ohm coils/tanks. You just have much more ability to adjust the vapor to whatever you are using and to your personal preferences (which you may not even know yet).
If you used external batteries, you'd just pop in a spare charged battery into the device and continue vaping. This system will cost more innitially because you have to also buy a box battery charger ($20) and a couple of external batteries ($12), but you'll save money for the long term. Units that use an internal battery will become a useless paperweight once the battery dies (about one year) and you have to buy a whole new setup. Units that use external batteries, when the batteries die you just replace them (about $6 each) and continue to use the old mod.
Considering the above factors, I feel the additional cost is worth it. The choice is yours to make.
I understand folks don't want to spend more money than they need to, and sometimes we just don't have the money to buy the things we want. Novices sometimes balk at the price it costs to start vaping. I counter that you will need to determine how much you spend per month on cigarettes to help justify startup costs.
At $5 - $10 a pack, a pack-a-day smoker spends $150 to $300 a month to smoke. With that budget in mind, you should be able to find a reasonably priced setup with most of the bells & whistles. Then consider that once you have your gear or hardware, your subsequent costs per month will be only for replacement coils for your tanks and e-liquid (about $70 - $90 a month). You'll be saving money when you are vaping.