I was just wondering wether there is any advantage of a 33 or a 35. I've got stock 18 inch rims and a 2.5 inch leveling kit. Anyone who knows anything about this please help. And also I like aggressive all terrains or mud tires

 

Better traction in the elements (mud, snow etc) is about the extent of it aside from looks. Downsides can be loss of gas mileage and more draw in the horsepower catagory.

 

Not much other than looks and you will loose more torque with 35's than 33's.