Dean, what do you want? Do you want us to say "yeah, go for this one" or "go for that one"? If that is the case, go for the 10".
If you want someone to tell you what to get, because you think it's easier for someone to tell you what you would want to hear, rather than what need to hear, again, go for the 10".
If you want someone to tell you what 25 years experience says, then a newtonian from a balcony is not the way to go. I've got 5 scopes: a 2" refractor, a 5" Schmidt-Cassegrain, and three newt's 8", 10" & 17.5". I've also lived in units, terrace houses and freestanding homes, and taken scopes to many, many locations. Have I taken a newtonian to a place with limited access to space or sky, including balconies, and yes, and it was a poor choice. Never was it for lugging the thing up and down stairs.
You asked for the best choice for your balcony, a Nexstar 130 or a 10" dob. Of these two, the 130.
But looks like you want to really want to hear the 10". Then, hey, go the 10", all the way! Bigger is better.
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