I think the better question is which is better karmically.
Whenever I've had a crit range of 15-20 my dice only seem to roll 1-14 or natural 20s as if they were in defiance of my mathematically chosen weapon. When they do roll a 15-19 it seems to be against an opponent that I don't hit with that roll.
Might as well just pick whatever weapon seems cooler.
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I know the maths people will say otherwise but I prefer x4 crit multipliers as a crit will either kill or seriously, seriously hurt your opponent. A light pick is a nice option for 2 weapon fighting.
I know in terms of mathematical progression the 'raw' DPR gives a fixed number to compare weapons with but high crit multipliers do seriously ramp up the element of randomness in combats and so I wouldn't get too hung up on 'just' DPR.
Get a buddy with dual keen kukris and get the Butterfly Sting teamwork feat. That way your buddy can pass off his criticals to you, and you deal the x4. Best of both worlds.