By any size battery, do you mean any common size (Only AAA, AA, C, and D)? Because if you include CR123A lithium batteries, or any li-ion rechargeable batteries, a whole new level of brightness is open to you.
There's isn't too much competition for common cell size current gen LED lights, except recently 1xAA and 1xAAA lights. The Fenix L2D Premium Q5 is probably the brightest 2xAA (I don't have the Taskforce, but I think the Fenix may be brighter overall than it. But less throw).
Again, I have the L2D Q5, but not the Taskforce, so I can only be completely reliable in my comments on the Fenix. It has excellent build quality, but you have to realize the difference between build quality and toughness. Some lights have 1/4" thick walls, so can take more than the Fenix. But the fenix is well-made, and operates very reliably and very well.
To briefly compare CREE and Luxeon, I will compare only their best products. CREE produces the most efficient LED, labeled the R2 bin, that acheives 114 lumens per watt. Luxeon's Rebel 100 acheives only 100, as well as (I beleive) SSC's top bin P4. So the best choice would be a CREE R2, but some people complain about CREE's ringiness. This is sometimes coped with very well by the flashlight using it, but if it is not then you might prefer a smoother SSC or Luxeon LED, despite it being dimmer.
One last note: there are only 3 flashlights available with a R2 CREE that I know of, as it has just come out. The more common CREE to see is the Q5 bin. A WC tint Q5 has a pure white tint, unlike any of the other LEDs. It acheives 107 lumens/watt, so everything I said before still stands with a Q5.