You can't beat aperture, especially when the focal lengths of the two scopes are nearly identical.
Having owned an ETX-125, I would definitely suggest the 8 incher, it gathers 2.5 times the light of the 125 and so will do a good job on DSOs as well as planets. Plus you can add a focuser/corrector which will bring the focal ratio down to F6.3 and allow for a wider field of view in the bargin.
Thats what I would do...
jon
Having owned an ETX-125, I would definitely suggest the 8 incher, it gathers 2.5 times the light of the 125 and so will do a good job on DSOs as well as planets. Plus you can add a focuser/corrector which will bring the focal ratio down to F6.3 and allow for a wider field of view in the bargin.
Thats what I would do...
jon
