I know you want to do both but ulimately what do will you end up doing.
Planetary mostly - 8" with tracking.
But if you intend to do DSO mostly which there is a lot more to see then 10" is the way to go. If you can wait a bit longer to save the pennies then track as well.
Even though I do planetary mostly, I know I made the right choice for 12" as I know I will further down the track will observe more DSO. I will also purchace a heavy duty mount for the DOB in the future or build one. DOB tracking was not available when I bought my scope.
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