You're not comparing like with like apart from the engine size, there's a big difference in mileage, they are both using different transmissions and a 7k difference in price - no mention of condition, history etc, what your budget is or some way to determine how cheap/expensive those 2 cars are compared to others in the area.
Personally, I would prefer the 3.0 Manual - then again I would say that because I have one. When I bought it, it was the right car for me. You'll need to do the same, weigh it up in terms of what you want.