Depends on what you need it for.
General work, the two or three "D" cell version is good. In fact the 3-cell version can double as a "night-stick" for self-defense. It is solid but not too heavy to swing around. My friend used to have a 4-cell version but I thought it was too heavy to be useful in a fight situation.
If you want portable, the ones with 2 AA batteries is nice and bright and pocketable.
The small ones that use a single AAA battery is cute but kinda useless in most situations.





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