I would think that 1" chips wouldn't look the best in most applications. An uneven spread would be very obvious. With the smaller flakes one has a lot more fudge factor available to make small errors in broadcast.
However with proper planning large flakes can look very attractive. Here's one great looking job where the owner put down a 3 very large orange chips on a blue base coat
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For a DIY project I'd say stick to the 1/4" flakes. But if you have a pro doing the install then the main consideration is aesthetics; do you like the look of the larger flakes? If so, that's the way to go.
Personally I'd only go with larger flakes only if is was a good size space, 1,000 ft2 or more. But again, that's just personal taste.
