I have the next level up of both those bikes. My Rockhopper Comp and my 4500 are both nice. I find them to be on par with each other, and I would assume the same with the RH and the 4300.
I have rode both the Rockhopper base model and the 4300, and found that I am glad I saved a bit more money and went up a level however.
I prefer the geometry of the Rockhopper better. So much so, that I plan to upgrade the already decent mid-level components to high end and make this my project bike for next winter.
I would suggest riding them both and see which one feels better. The componentry is basically on-par with each other, with maybe a small nod to Specialized.