Personally, I prefer Turkey, you have a good, strong defensive position and your choices, while limited, are obvious. Sure, it can be frustrating that you can only attack Austria or Russia (or both), but at least you know what you have to do. Or maybe it's just because I'm a crap player.
But with Italy, attacking Austria usually means that Germany won't be happy, and is hard to pull off with out Russian help. An attack against France takes a while to set up, and ts/he can see it from a mile away. Attacking Germany can be hard, as Austria will be annoyed, and you can only attack through Tyrolia, and therefore must rely on French help, which may or may not come, and who would want Munich for him/herself.