Ask a hundred torch enthusiasts what a "tactical" torch is and you'll get a hundred answers. IMHO they should have a tail-switch capable of turning on at full power; a beam capable of identifying targets at 100 metres or more; a compact size so they can be carried easily and held in a variety of hand positions; and a very robust and waterproof design to work reliably in all conditions.
Although the ability to mount the torch to a weapon is not usually considered essential for a tactical torch, the B158 Bullseye scores highly in this regard as it was designed from the outset for this purpose. All offer a range of brightness levels including "moonlight mode" to move about without being conspicuous or impairing your night vision, and a tactical strobe (see here to read about the Dutch police experience with strobes).
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