my very first battery a 650 ego twist, a provari (a very generous act allowed me to adopt said provari), and a vamo go everywhere with me

upstairs..downstairs..shopping...work....they don't like the truck that much...honestly i think they like it just fine...it's their heads (tanks) that don't like traveling...or work...but they still go.
on adventures i run the vamo in shorty mode...at home in 18650 mode.
i also have a 400mah ego, and a digital VV ego....which is on it's last legs and it is newer than everything else....
I have a nitecore I2 (like steph's only 2 bays instead of 4), 3 batteries for the provari, 3 18350s for vamo shorty mode, 2 18650s for vamo in super mondo nightstick mode (i'm 5'2" for pete's sake)
i really feel like i use all of them equally...and have decided the right delivery system for the right device is paramount.
I have some lower ohm cartos (1.8ohm-ish) that are fabulous on the ego...not so much on the vamo/prov
i switch between all three ALL day long
the biggest "pro" i have seen from the provari camp is that you can spend the higher ticket price for a provari now and not have to keep replacing other devices (aka RIP purple spinner)....that you will end up spending the same amount or more than the cost of a provari over time.
Being USA made is VERY important to some folks (and really should be at least a consideration to all of us that live in the usa...another thread/time for that LOL) but even provape has posted here that not all components are USA made...they just really can't be.
it isn't complicated...less complicated than trying to read the dang volts on a twist! (no more flashlight/granny glasses for setting voltage all the time...i've read that the spinner is easier to read)
the biggest "pro" i have seen from the vamo camp is variable wattage (aside from the lower cost). I had a shopping cart with a spinner/twist combo for more than 3 weeks that i just couldn't ever pull the trigger on....once i figured out that i could get the vamo+batteries for about the same price (with free shipping and a coupon code) i thanked myself for holding back.
currently these three devices are what i see recommended the most (outside of mech mods, rbas, and super duper fancy mega ultra mods)
the vamo in shorty mode, provari, ego 650mah are all pretty much the same height...with the ego being considerably skinnier. (there is also a provari mini)
honestly...i got the vamo because it was a reasonable price, had two lengths/battery options, and i wanted to put a smiley mouth on it's scared little robot face (totally serious)..which i still haven't done LOL
bottom line is that whatever keeps you happily vaping along is what is important...whether it is 30 ego type batteries or one provari/vamo/whatchahizzle.
(i don't recommend having only one of anything...devices, delivery systems, batteries, juice flavors, etc...just sayin'

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phew...i dunno if anyone read all of that...talk about a monster post LOL