AlternativeTo makes it easy to quickly find stuff. The lists are organized by likes which floats the best content to the top, and helpful tags warn you of undesirable attributes (such as the product being discontinued or if it includes bundleware).
AlternativeTo excels at showing you options, however it doesn't really tell you why one option is better/worse than another. It lists options by the number of likes it has received, but to directly compare the options is relatively hard to do.
Most Q&A sites give each user the chance to give an answer (sometimes multiple answers). A lot of the content of each user's answers will overlap, resulting in duplication of information (thus more to read), or information being lost in noise (e.g. if someone sees existing answers and adds a missing point without copying existing information, their point will likely languish at the bottom of the list of answers as it did not answer the majority of the question).
Slant approaches this differently; rather than focusing on the users, it focuses on the points; Pros and Cons. Any user may amend the information in a pro/con, may vote based on how much that pro/con influenced their decision, and may add their own pros and cons if certain points are missing from the canon.
Unlike a number of other Q&A sites where the person asking the question picks the winning answer, Slant accepts that they're asking because they don't know the answer, so they allow everyone in the community to pitch in by upvoting the best answer.
An enumeration of recommendations is easily viewed as a list, making it a good starting point for researching available options. This is the opposite of other sites in which multiple choices may be listed within a single answer, with the need for the user to read through paragraphs of information to pick out the key articles.
Slant.co's reason for being is to answer subjective questions. It was born with the knowledge that other sites existed to handle objective questions and answers, but they made no attempt to handle the intricacies of subjective answers. Slant.co is the only site focused on solving this specific area.
Each subjective statement needs to be backed up with objective information. An opinion has to be backed up with facts. An evidence for a claim on Slant can be provided with examples, sources, and facts.
You do not need to have an account to view existing content (questions or answers). People can see what they're getting into before deciding if they'd like to sign up for an account and contribute to the site.
Subjective questions may have more than one answer. Slant allows people to vote for more than one answer as being correct, and to append the pros and cons which influenced their decision to their vote; thus giving a context of in which situations each answer may be considered correct.
Slant isn't financially tied to any products listed on it. All the categories (organized into 'questions'), products (organized as 'options'), and pros/cons are added, and edited by real users - there is no way for a company to pay to have a favorable review (and if they try to do it themselves, the community can report (flag) or edit any false claims.
Since anyone can edit content on the site, the pace at which information changes are reflected on the site is not arbitrarily limited by the number of writers the site has.
Context such as purpose, limitations, and situations change what options should be recommended and what pros and cons should be surfaced. For example, a comparison of Linux distributions for general use and Linux distributions for development will discuss the topics in different ways.
On the left of the site are a bunch of categories, and each of those are divided into sub-categories. this makes it very quick and easy to find what you're looking for without wading through other content. Once you've selected the list you want, the bigger lists have a table of contents where you can skip ahead to what you're looking for.
The information may not be extremely detailed, but there is a lot of content on the site. This is one of the best sites to look through if you want a list of virtually every choice possible.
Often times when searching through lists, it's quickest and easiest to have a few of the best options represented near the top of the page, as most people aren't going to scroll down and look through each option.
The way the site is organized gives you lots of options at a glance, however with only a single line description you'll almost always need to click the link to see what the options actually offer.