Definately the Panasonic Plasma unless you need a thinner display or a less reflective surface or will be using it extensively for gaming.
FWIW, a few years ago Panasonic bought all of Pioneer's Kuro tech and have integrated much of it into their plasma's.
FWIW, a few years ago Panasonic bought all of Pioneer's Kuro tech and have integrated much of it into their plasma's.