I believe the Uruk-hai could win, but this is completely circumstancial.  If the fight was in a forest then the Uruk-hai could use guerilla tactics against the Olog-hai. 
 
Plus we know that orcs utilize a wide range of weapons, suppose Trolls only use clubs. Then orcs would be able to pick off a large number of trolls with arrows before the trolls actually got to the orcs.   
 
And even if the trolls were olog-hai, would that  enable them to fight using tactics, I mean do we know for sure if Olog-hai are smarter than normal trolls?
		 
		
		
		
		
		
		
		
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