If you want it to fit as flush as possible with your battery, I would go with the nautilus Mini. If the size isn't an issue and you want the higher capacity (you don't need to refill as often) then I would go with the nautilus.
If it was me and I had to choose one to use on a stick battery, I would go with the Mini.
Awesome thx if they do the same job I'll go with the higher capacity one....less refills etc