When comparing Steam Chat vs Discord, the Slant community recommends Discord for most people. In the question“What is the best voice chat for gaming?” Discord is ranked 2nd while Steam Chat is ranked 6th. The most important reason people chose Discord is:
Discord follows the same type of interface design popularised by Slack, which is extremely clean and attractive, and doesn't clutter the interface with unnecessary chrome and cruft.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Easily one click invite
Now you can create and send links that will invite people directly into your group chat. Email, message, or text the link for them to join from the Steam Client or a web browser.
Pro Supports mobile clients
Steam has a fully-featured mobile client support for Android and iOS, which makes it very easy to check in on the app and communicate while on the go.
Pro Gets installed with Steam
When you are using someone else's computer for playing games Steam is normally installed
Pro Modernized chat
Every chat on Steam is now multi-media friendly. Getting your point across is easier than ever, now that everyone can see your GIFs inline rather than a list of links. Paste a picture from the clipboard and upload it directly to the chat.
Pro Add friends easily to chat
Want to bring someone into a conversation? Just drag and drop your friends from the Friends List to send them an invite.
Pro Can be used in browser
All of these features have been built to work not only in the Steam client, but also on the web. So you can continue conversations when you have access to a web browser but you're not logged in to the Steam client.
Pro Servers
Put up a server instantly, add channels and invite!
Pro Group friends by game & party
Your in-game friends are now grouped by the game they're playing, making it easier to join them, or to see which games are popular among friends. And see who's playing together. You can watch friends enter into a match and then emerge when their game is over. Be ready to dive in with them or to play when they're done.
Pro User friendly
Discord follows the same type of interface design popularised by Slack, which is extremely clean and attractive, and doesn't clutter the interface with unnecessary chrome and cruft.
Pro Free for unlimited users
Unlimited amount of users.
Pro Can be used in browser
Users can invite others to join a Discord channel via a web link, which means no installation is required to use the software - which is one of the big typical barriers to entry for social software.
Pro Good 1-click invite system
Discord allows inviting people to a specific channel with a link. Links can be set to expire. Low effort/passive invite mechanics.
Pro Easy setup
You can quickly send invites to people and they can join in using the web client without having to create an account or install the app.
Pro Has low-latency VoIP support
Pro Supports video and text communication
Behaves and looks like Slack for regular text channels, but with the ability to create voice channels as well
Pro Numerous controls for setting member roles.
Deny access, Deny write message, Allow read messages etc.
Pro Ability to create bots
Discord provides an API for creating custom bots.
Pro Open source bots and management tools
Discord has a wide variety of bots for things from airhorn noises to automated server management, to leveling systems for chat. The bot API is open and there are dedicated sites for finding bots.
Pro Game integration
Discord shows which game each user is currently playing, which among other things helps users to form PUGs with minimal hassle.
Pro Dark theme out of the box
Pro Familiar for Slack users
For those that are used to the way Slack (a similar chat client) works, Discord will be familiar in its use, which lowers the learning curve quite a bit for those that have switched or tried Slack before.
Pro Low effort invite mechanics
Pro Android app has push notifications
Pro Syntax highlighting and Markdown support
The support is limited but still exists. It's a killer feature for dev teams.
Pro DDoS mitigation
Discord prevents users from being DDoSed out of games.
Pro Targeting of roles
Targeting roles allows for quickly requesting someone from a group e.g. artist, moderator, etc.
Pro Ability to thread channels
Ability to create channel categories for channels to sit inside of.
Pro Friendly payment policy
Free account have no tangible restrictions.
Premium account is just a way to say "thank you" to developers. And it work for all servers of discord (not as in slack). And it can be purchased by one who wants. In contrast to Slask, where all active members of the server should be "premium".
Pro Language localization
Have localization for many language, including Russian.
Pro Does not allow NSFW related things to be posted unless in a NSFW channel
Cons
Con Unstable
Better interface than the former Steam chat, but UI does not mean anything if voice chat does not work. If you won't use if for voice chat, especially for gaming, then it is good (like streaming etc.) but its voice chat is a bug nest.
Con Proprietary software
Discord is closed-source, meaning their code isn't available for inspection or reproduction
Con Based on Electron = eats a lot of ram
Con Some functions cut out and available only with "Nitro" subscription
Con Developer's previous company was sued for privacy violations, among other things
See:
http://classactionlawsuitsinthenews.com/class-action-lawsuit-complaints/openfeint-green-international-privacy-class-action-lawsuit-complaint/
https://www.ftc.gov/enforcement/cases-proceedings/closing-letters/openfeint-inc
Discord's privacy policy also states that while they might not sell your data, a company they get sold to will quite possibly attain said data and thus may be in "more" shady hands.
Con No self-hosting avaliable
Discord is wholly hosted by Discord (the company), you cannot run private instances, and all servers are hosted on their infrastructure. For most people, this won't really impact their usage.
Con Not a generic "team chat" tool
All the UI and the features are aimed specifically at communicating with your gaming team/clan.