I think that a lot of it has to do with circumstances. There are circumstances where the Uruk-hai would fair better than the trolls.
I believe that the Uruk-hai are somewhat intelligent and they would not run into a field and fight trolls at midnight evenly matched. The Uruk-hai would wait until they could find a suitable time and place to fight that would be advantageous to them and would further their winning chances.
But one on one a troll would obliterate an orc.
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'The Black Rider flung back his hood, and behold! he had a kingly crown; and yet upon no head visible was it set. The red fires shone between it and the mantled shoulders vast and dark.'
Witch King of Angmar as described at the Siege of Gondor
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