(BTW, not saying this is off-topic or anything, just that that stack exchange is a really good resource, IMO)
I never understood why the various variants of "phpBB"-style, table-like layouts became so popular. I much prefer something that looks like irssi (perhaps with some support for indenting blocks, with optional syntax colouring).
Or, if the goal is "long form" comments, something that reads more or less like properly quoted, properly re-flowed text emails:
>>> Example line, but too short paragraph to
>>> adequately illustrate superiority
>>
>> With a response that is similarly afflicted
>
> Another line -- you'd probably have to have sender
> somewhere, maybe in the margins, if we're trying to
> move beyond simple text?
I think margins would work.
I'm not saying that one has to use brackets and only text, I'm fine with using fonts, colours and white space -- just make sure you're improving on the UIs from the 70s with the bling-bling.If the former, I'd say balloons, as there's very little other grouping indicators present in the individual comments (and the page design looks pretty flat in general).
If it's the later, we'd need to consider the design of the elements of the page and the relationship between various headers and text elements before a good decision could be reached. As well, more color/size/contrast elements in a potential design may force the balloon elements to be of a much higher contrast themselves, which could ultimately overload the page.
1) One of the provided design might be bad and so people will choose the other one. For example text balloons background is slightly grey and the space between the comments is bigger than the separation line on the minimal chrome. Also the separation line is the same color as the code example and the attached image border, which kinda makes a different perception of the whole content. So here I would choose balloons, because of this flaw.
2) The dummy content might look better in one of the two designs, which doesn't mean that the concept of the case is bad, but just the rendering. ( This can be solved by providing a design + content for the two cases that makes them look equally ( another subjectivism ) good. )
3) Misunderstandings about the question. What is being asked here : Which one of those two designs is better? or Which concept is better?
I like balloons or some other kind of containers for threaded forums. For flat forums it seems they're useless.
Overall I don't feel strongly towards either, but I'd maybe pick the balloons if I had to pick something.
http://blog.codinghorror.com/discussions-flat-or-threaded/
http://blog.codinghorror.com/web-discussions-flat-by-design/
(from 2006 and 2012)
I still don't agree with Feels great to use. It's fun.
from:
http://blog.codinghorror.com/civilized-discourse-constructio...
So maybe I'm a weirdo, but I think maybe Discourse embraces one set of people based on a certain way of interacting with information.