The BFL Coil is more suited for mouth-to-lung vaping at 20w-40w
The BFXL Coil is more suited for direct lung vaping at 30w-50w
These coils are my favourite. I love the Unimax Tank. The price worked out to $1 per coil. Awesome deal. Also tried the Black Licorice juice the order before; it was awesome.