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If you want to do slow shutter stuff in bright light you'll probably need the 10 stop.
It really depends on the light available, you'd need to go to the lowest ISO, highest aperture and the slowest shutter speed, but in anything approaching sunlight you're likely to be overexposed if you want to get speeds of half a second plus.
If you could get a good exposure at 1/125 sec then your 3 stoppper will only take you down to 1/15sec whereas your 10 stopper will take you to 8 seconds.
It depends on what shutter speeds you're trying to achieve
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