@Steevo My wife and I use an aspire k1 on an Ego and like it for mouth to lung. I do mainly use a diy 80/20 VG/PG with a just a dash of menthol crystals for flavor, easily get a month or more out of 1 coil.
A few notes I hope help you out, generally speaking:
Lower ohms = more power needed = warmer to hotter, to OMG STOP vape.
Higher ohms = less power needed = cooler vape.
Given the factors above can we raise of lower power to get more or less out of either a low ohm or high ohm coil? Yes, within limits.
Can anyone tell me what I would like? No, Not unless they can see into the future after you have tried a lot of different things.
Can anyone tell me if I will like the flavor of coil x? No, same as above. If I ask them to compare coil x they know to a coil we both know however, that is possible.
Does the Ego One VT have an RBA, NO. Also it is a Temperature Control OR Power Mode, designed to be easy to use for people. It has a decent range of coils to suit different tastes. Until you have actually tried TC, I couldn't possibly tell you if you would like it or not. The 2 main selling points to TC is not to burn the wicks of coils. Unless you vape it until the tank is empty any GOOD device really should not burn a wick even in power mode.
NEVER use Ti or Ni coils in POWER MODE.
Stainless Steel (SS) can be used in both TC and power mode, providing your mod supports it.
I can't tell you if you care about the Ni or Ti coils, you will need to read up on the safety of each and make an informed decision for yourself. I can say I feel that both are likely a safer option than smoking.
Some personal experiences I have had may give you some perspective here...
Your juice has a potentially huge impact on your coils. Some burn clean, others can gunk your coil up in 1-2 days. I think this is the major factor in longevity.
It can take a while but reading reviews/watching videos of devices/coils can seriously help you make more informed choices.
I recently bought a Wismec 75w TC mod and a Uwell Crown tank. I tried the stock Stainless Steel Dual coils at .25 and at .5 ohms, along with the .5 Ti and the separately purchasable RBA I tried a .25 SS coil (it came with 3 pre mades) here are my findings:
The low ohm dual coils are too hot for my liking in power mode.
Trying them in TC mode was well Different but still too warm for my tastes, or too little vapor at the lower temperatures.
Using the RBA is much better for me, the more restricted airflow pairs well with low power and low temperature mode for my taste. On the .25 SS coil in power mode I can vape it from 10 watts to 20 watts either mouth to lung or direct lung inhale depending on airflow setting. I can make my 42" tv vanish blowing clouds in front of me at this low a wattage.
Trying the exact same coil in TC mode in the rba at the default 75w, at low temps only produced tiny wisps of vapor which was not satisfying. Turning up the temp to the point the vapor better but was still not as good as the k1 and produced a too hot for me result.
Next I lowered the max power of the mod to 30w in TC mode, this was much better in both vapor and coolness. I can see possibly being able to use this if I fiddle with it more to dial it into my Goldilocks zone.
I did order some of the 1.2 ohm dual coils to try, and I will most likely be building a higher resistance coil on the rba as well.
A Potential issue with the Ego One VTC is the limited settings, low, medium, high. If you like one of them GREAT! If you do not, your hosed. My Strong suggestion on any mod that has limited adjust-ability is go to a B&M store and see if you can try before you buy. It is made to be easy and simple to use, and I am fairly confident I could get grandparents to be able to using it. So if you try it and like it, it is worthwhile for ease of use.
The upside to your other listed option the kanger sub box (mini?) is it is far more adjustable in power level than the Ego One VT, but it does not do TC if that is something you care about. Some report tanks leak, others have worked around that.
For the price of the Kanger ($55) I would ask you to compare other mods in that price range. I just did the same thing myself over the course of 2 months before buying the Wismec 75w TC. Granted I paid $40 for my mod, close to 10 more for a (top of the line) battery, and around $35 more for the crown tank and RBA.
I paid more but ended up with a mod that is in my opinion:
Very comfortable, fires via a squeeze from either hand no matter if it is facing front or back in my hand.
Can do power mode, or tc mode, options are nice, you may not need some.
Is up-gradable via USB, I will not recommend anything that is not these days.
Is rechargeable via front facing USB (or swap out batteries) while the mod is standing up with a tank attached. Handy.
Has a tank that can be top filled. We fill tanks often, why should it be a chore?!
Has a wide enuff assortment of stock coils and available rba to suit ME.
Comes in matching mod/tank colors. (Black like my heart) Personal taste.
Not everyone can be bothered or wants to fiddle with rebuilding coils. Do you?
Not everyone is suited to a simple device. I want choices/options.How about you?
Not everyone is suited to a more complicated device. I am fine with learning, others may be more like "there is more than 1 button?!, too much for me!" Which are you?
Hope this helps, good luck!