Hi RG,
I happen to own all 4 devices that you are considering, so I think I'm able to give a pretty fair assessment of each. Also, I don't use tanks or cartomizers.......I'm strictly an atomizer/drip guy (both standard and LR510 and 901), so I can't comment on how well these mods do with tanks.
First off, all of these mods work extremely well, but there are differences. In terms of size, in descending order, the SB is the largest, followed by the Omega, the BB, and then the Alpha. Both the Omega and the Alpha are purely mechanical devices, while the SB and BB employ a switch to activate the atomizer. To me, this is not a big deal, since they all fire every time.
I find the side button placement on both the SB and BB to be more natural for me.......the Alpha and Omega require the bottom section to be pushed forward to activate. Which is preferable is really just a matter of choice.
In terms of maintenance, both the Alpha and Omega require a bit more cleaning........but not much. I haven't had to do anything yet, but I have so many mods, neither is in use every day.
Since both the SB and Omega use an 18650 battery, they provide more vape-time between charges. I usually get a full day out of each. On the other hand, the Omega and Alpha use a 14500 battery, so their vape-time between charges is not nearly as long (for me, at least). I also find the 18650 to hit better right from the start.
If I had to choose one of the four, it would be the Bullet.......simply because that's the one I find myself reaching for most often. But that, of course, is just my opinion. I hope I've been of some help.
