Radian 8mm vs. Nagler 9mm

I'm trying to decide between these two for use in a 8"f/6 dob.I have a 10mm plossl which is ok but I'd like a little more power along with a better image.It would be for planetary and globular cluster use.Image quality would be a higher priority then FOV.Any opinions?

I don't have a 8" F 6 but I do have a 6" F 8, which has the same focal length. Having viewed through a 9mm Nagler, I would say that it would be fantastic for globulars and the moon with your scope. For the planets though I don't think the 9 would be quite enough power (I have a 9 for my scope and I always want a bit more power on the planets). I'd go with a 7mm U.O. or equivalent ortho or a Takahashi 7.5mm LE or a Pentax XL 7mm for the planets. I'd also add a good 2x 3 element shorty barlow for use with the 10mm when the seeing is exceptional. If you wear glasses when observing then Radians or Pentax XL eyepieces would be a better choice.