That's a good question Goniloc. First of all I personally think that reddit is a great website, with many fantastic aspects. I don't think it's a competition, I think the two are vastly different and satisfy different niches for people.
On reddit you tend to follow topics via subreddits. On Hubski you can follow topics via tags, but most people follow other people. For example, I follow humanodon, lil, theadvancedapes, minimum_wage and many others because they post content I appreciate on a variety of topics. This way, my feed is comprised of a multitude of different topics from many different sources.
But, my favorite part of Hubski is the community. People are generally very civil, smart and creative. I'm sure civil, smart and creative people exist on reddit too. Again, I don't think it's a competition. Hubski is a small community, one person described it to me as a "boutique website." I guess that makes sense.
What I think most people on Hubski would agree with me about is that it takes some time. People on Hubski tend to have connections with one another that are lasting. They have ongoing conversations, debates etc. It's much harder to be vitriolic when you know you are likely to converse with that person again.
You might want to check out the about page, the FAQ page and definitely check out the tutorial at the bottom of the page when you are in your feed.
Also, for some of the best content, check out the badges link at the top of the page. Hope this helps. If you have any questions, feel free to let me know.
I don't eat at just one restaurant, why would I visit just one online community? I think there is room for many online haunts, and Hubski is one of them.