Welcome
At this point given the uncertainty with what could happen to hardware choices next year, and so you could just swap out batteries versus waiting fir a recharge, i would go with a mod or 2 (or ...) where you can use your own batteries.
Just my thought, i do have an istick 30, very compact device which is really nice... just i know when its done, it is done. I think the sigelei mini has a little edge over it too in terms of quality.
Haven't tried the subox at all.
My blog has a little on the few mods i have.
Enjoy