White or Brown eggs---There is no nutritional difference.

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White or Brown: Eggshell colour is determined by the type of hen that lays it. There is no nutritional difference.
* l2 }* b  L- }9 uWhite eggs are laid by white-feathered hens.
- X9 R" W- p* m) R" j6 b3 ^# iThese are the most common laying hens in Canada. White eggs are usually less expensive than brown eggs.
Brown-feathered hens usually lay brown eggs.
# X7 \3 p5 X$ G7 x$ l0 tProducing brown eggs costs more because brown hens are larger than white ones and they eat more feed.

Young hens lay pee wee eggs and older hens lay jumbo eggs;
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Free-run eggs are nutritionally the same as regular eggs.

' d7 l' T' {; c7 }4 ZOrganic eggs are nutritionally the same as regular eggs.
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5 g* r2 X& U) }6 \: M- d5 f0 O3 nFree-range eggs are nutritionally the same as regular eggs.
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Here is articles:
' X+ p" s+ k  _' S3 {; V; d8 Lhttp://www.getcracking.ca/EDU/a_guide_to_choosing_eggs.pdf