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.
4 X  u' }4 j. Q0 H9 G2 MWhite eggs are laid by white-feathered hens.
( B5 c( Q+ {0 c! q' DThese are the most common laying hens in Canada. White eggs are usually less expensive than brown eggs.
Brown-feathered hens usually lay brown eggs.
Producing brown eggs costs more because brown hens are larger than white ones and they eat more feed.

/ J1 ~/ c7 b  _3 [$ c. kYoung hens lay pee wee eggs and older hens lay jumbo eggs;

1 s  \6 O% j( N; M' ]Free-run eggs are nutritionally the same as regular eggs.

Organic eggs are nutritionally the same as regular eggs.

* P- {" }% o0 C) b; H) n- t. pFree-range eggs are nutritionally the same as regular eggs.
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5 `- R2 ]2 Q. p/ w4 p7 A" y
/ R4 r) W3 o1 sHere is articles:
http://www.getcracking.ca/EDU/a_guide_to_choosing_eggs.pdf