hi waqas, nice topic. first of all let me tell you some thing , Pakistan might be the only country i world where people love to drive deisel. Other wise here in AUS deisel is as expensive as petrol. so $$$ wise here no advantage.
Performance Wise , it all depends on how much power the specificengine is generating i.e. how much KW/HP. e.g. new Nissan patrol claims to be most power full diesel engine having 183 KW.
Off road performance not neccesarily depends on the enigne but alot on other stuff , like off-road ability, body roll, etc
well this was the start