One thing that focusing can do is tighten the beam up a little which allows better penetration if you have a night with a lot of crap flying around or backscatter. I found that with de-doming one of the MAxtoch's I have - the biggest effect was tightening up the beam and it actually made it more useful on slightly cruddy nights. As per, mileage might vary but I'd probably go with the better focusing beam if I had the option.
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