I like the Milwaukee torch blades. you can kink them and keep going. they are thicker and reinforced where it matters so can handle an ohps or two. I preffer the 9" blades. diablo are about the same life wise.
have run lenox blades and busted them left and right. same with dewalt and morse. black & decker walmart blades are not too great but hold better for me than previous couple brands.
never had a chance to use the fire demo types.
in reality it comes to prefference and what works best for you and your cutting style. I like the reinforced tabs because I cut awkward angles and small spaces so tend to bend a blade and the torches can handle it and I tend to actually wear out the blades.