You are right, Geoff. I spoke in haste. My comments about ED80 under dark sky bettering Dobs under light polluted sky are only valid in the limited context of wide views of large DSOs (e.g., wide views of 47tuc, omega cent, orion neb). On planets, on small but relatively bright clusters, and on any greater than approx 80x views of the heavens, the Dobs will rule, dark sky or not...
I guess by "better" I meant "more entertaining" in my earlier post. To rephrase: I'd rather be under mag 6.5 skies with an ED80 than under mag 4 skies with a 10" Dob.
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