I, too, was tempted by those 'other'
batteries. I have no idea why, because I have three BMF
batteries and love them, but there seems to be a certain "gear acquisition syndrome" that happens with other pursuits as well.
I finally decided to stick with the batteries I'm already happy with. At $20/each, they aren't cheap, but they sure do the job, and last a long time for the way I vape.