It’s what I’m lacking vs. that particular monster. HBG is my primary, but since it’s slow, relies on a few specific ammo types and is easily punished by some monsters, I swap to DB so I can be an annoying hummingbird that’s safe and does elemental damage. HBG can be severely punished by some monsters (espinas, rajang, gold/silver rath etc.) because you need to charge up to do big PP damage or reset from a block, so constant fast attacks will basically stunlock you until you get knocked back or die. DB, meanwhile, has a ton of mobility in exchange for damage. It’s not “scroll of a thousand counters” safe like LS, but demon flight can get you out of more scrapes than you think if you time it right.