I started with Smokeless Image Volts and an X2 (their eGo sized battery). I moved on to the Altsmoke BB and Silver Bullet for more versatility in battery life, larger juice capacity, and more choices in juice delivery devices. Going with more durable battery carriers than the "disposable" stick and eGo type devices was a major factor also. I can carry just one APV with an extra battery in tow instead of the need for carrying multiple devices. I prefer to buy American made APV's that will continue to service their product after warranty.
I had no intention of advancing on to variable voltage until the owner of Altsmoke took my Silver Bullet and added a sleeve and Kick to it for demo purposes. I was frankly amazed at tasting my favorite juice at higher voltage for the first time. Since I change flavors so frequently and figured I would need to change the voltage for each one (which turned out to be true), a Kick for my SB did not appear to fit my intended vaping experience. I went with a regular-sized Provari and couldn't be more pleased.
I would have preferred a Mini Provari to use for quick out-and-about runs to the store, but I couldn't justify another $175 + batteries at the current time. I got a Smoktech Variable Voltage Gripper for $50 and so far have been quite satisfied. Like many of the cheaper Chinese APV's that use PWM, it hits hotter than its set voltage, but I realized this before I bought it and adjust the voltage accordingly. I may still award myself with a Mini Provari for my 1 year smoke-free anniversary.
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So to answer the OP question, I feel it boils down to how long do you want the device to last you:
Short-term durability devices:
These are the rechargable batteries such as the stick batteries and eGo batteries that have a limited expected life span and are rated for 250 or so charges. Then they will need to be replaced. Cheaper to buy initially and closer to an analogue in form factor, but the battery duration is limited by its smaller size. 3-4 hours for the cig-look-a-likes; 6-12 hours for the longer eGo's. These are are relatively fragile when compared to the devices in the next category. More than one must be carried as a second one will be needed while the first one is being recharged. Narrow form factor can limit the capacity of juice carrying devices used.
Long-term durability devices:
These are the battery holders (tube or box mods) that are built to last years, and use replaceable batteries. More expensive initially, but the use of stronger materials will allow these devices to take some punishment yet continue to work. Only one device need be carried; when the replaceable battery's charge dies, it is merely replaced by another small battery. Much easier to carry a couple small batteries along than multiple additional devices like the stick or eGo batteries.
Depending upon the size of mod/batteries used, these devices can be used up to all day or more with a single battery. The batteries are cheaper (< $10) and last longer (said to last up to a year). The larger form factor also allows for larger juice carrying devices such as a cartotank, which can hold up to 8ml of juice.
I just goggled it...looks like I have my next purchase 
) I just don't see spending $$ on anything with lots of electronics. I do have a bottom feeder but it is totally mechanical. I do like the ability to change out my batteries w/out losing my entire vape though. With Twists, you can't use 'em when they're on the charger. 
