PQ-wise, the Samsungs and Panasonics are close to comaprable. The 7000/8000 will be virtually identical to the eye and the ST probably slightly worse, but not enough for most users to justify the difference. Color will be more accurate on the Samsungs.
How much does 3D matter to you? Here there will be a Samsung advantage for a couple reasons:
1) They use bluetooth for paring with the TV versus an inferior line-of-sight IR (with very limited distance range) for the Panasonic.
2) Depsite this, the Panasonic glasses are far more expense (~$100 each versus ~$20 each for Samsung).
3) Panasonic realized bluetooth is better for 2012 and has new, incompatible glasses for the new year. Which means it will get increasingly hard (and expensive) to get Panasonic IR glasses compatible with 2011 sets, except on the used market.
If 3D doesn't matter to you now or in the future with this set, save the money. Otherwise, get a Samsung.