Originally posted by mr.smiley
sauron created the urak-hai to counter the regular orcs weakness.Not for the shear fun of it
"The orcs were bred by the Dark power of the North in the elder days"
Uruk hai aren't a special breed of orc... they are just the warrior class of orcs. Note the word 'Uruk' in the Black speech is the term for Orc and hai defines their class. That's why orc slaves are called 'snaga'
Why in the world would Sauron only keep his uruk-hai from being weak in the sun? That's just pathetic logic. That's like saying im going to breed a million warriors that can't fight for shit in the day, except the really good ones, they can fight in the day cause they are the good warriors!
If Sauron can keep trolls, a race that turns into STONE in sunlight, from being affected by the sun, I'm certain he can do the same for orcs. Like I've said, it's just easier to use the darkness as humans have poor vision in the dark and orcs prefer the dark to begin with.