Binoculars for Astronomy
You are really comparing apples and oranges as far as astronomy binoculars go. In a nutshell, the issue is more a matter of technique than the quality.
A 10x50 is definitley hand-holdable, both from the standpoint of magnification and weight. Just grab the 10x50 and start observing; no tripod needed. A 10x50 can also do double duty for a whole range of applications.
The 20x80 will require a tripod due to the weight and the higher magnification. It will give you more performance than the 10x50, but at the expense of portability. It will be of limited use for other applications.
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