The Marumi has a bit more of a blue
cast, but is the closest match to the white balance with no polarizer
on. The Hoya HD does let in about half a stop more light, with a warmer
tint with hints of green. The old Nikon linear polarizer lets in
slightly more light than the Nikon or the Marumi, but like the Hoya
also is a but warmer (not as much as the Hoya) but has more of a
greenish tint. White balancing off the same spot in camera raw, the
Nikon II and Marumi match the original white balance, while the Hoya
and Linear polarizer retaining a slightly warmer, greener tone.
The reality is that any good polarizer will work well if you are
shooting raw on a modern dSLR and can tweek white balance in post
processing. The key is good, as the cheaper polarizers are just that,
and are often made of plastic. In my experience the Marumi DHG
polarizers offer the best bang for the buck, while the more expensive
Hoya HD is half a stop faster, but a bit off on the white balance,
despite their claim that "HOYA's polarising
filters do not affect the overall color balance of a shot."
For whitewater, why I still want to knock down reflections in the
shade, the Hoya is my filter of choice for that extra half stop, even
though it has the heaviest color cast.