Don't forget that all-in-one lenses make compromises.
The 18 mm - 200 mm might be a better choice as it is a DX lens, two thirds the weight and gives a wider fov. At 300 mm you may well want something that does not have the limitations of an all-in-one.
But it really depends upon what other lenses you have and will use, as well as the types of shots you want to take.
(I was convinced that I wanted the 28-300 to do for me on a FX body what the 18-200 does on my DX camera. But then I read about the distortion at either end of its range of focal length and decided I would stick with a wide prime and other lenses suited to what I intend to shoot.)