powerful propane torches

Product-categories of propane torches that are available, listed least powerful to most powerful:

• the top-end (in terms of flame strength) of the "normal" torch heads — Bernzomatic TS-8000, Bluefire BTS-8090, Bluefire MRAS-8099 — plumbers and other tradespeople use these [flame video]
• the Bluefire triple barrel [flame video]
• "flamethrower" style torches — SearPro, GrillBlazer Su-VGun, Bluu Kitchen Torch Pro, Flame King Grill Gun, etc [flame video]
• the "weed burner" style torches [flame video]