When comparing Pandora vs Slacker Radio, the Slant community recommends Pandora for most people. In the question“What are the best music streaming services?” Pandora is ranked 9th while Slacker Radio is ranked 10th. The most important reason people chose Pandora is:
The Pandora music streaming service is the best at predicting which songs the user would enjoy hearing. Unlike services which have rudimentary recommendation algorithms, Pandora uses over 400 selection attributes that are combined to form over 2,000 focus traits including rhythm syncopation, key tonality, harmonies, and instrumental proficiency. Not only does Pandora use this plethora of conditions to determine each song's inclusion in your station, but it also displays the specific reason that each song was played, as well as its relation to your input criteria.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Most personalized radio experience
The Pandora music streaming service is the best at predicting which songs the user would enjoy hearing. Unlike services which have rudimentary recommendation algorithms, Pandora uses over 400 selection attributes that are combined to form over 2,000 focus traits including rhythm syncopation, key tonality, harmonies, and instrumental proficiency.
Not only does Pandora use this plethora of conditions to determine each song's inclusion in your station, but it also displays the specific reason that each song was played, as well as its relation to your input criteria.
Pro Easily learns what you like and dislike
The Pandora music streaming service allows you to rate each song played with a "thumbs-up" or "thumbs-down" to signal your opinion of the song that is played. The station incorporates every single rating to intelligently learn your preferences over time, resulting in an extremely tailored station based on your input.
Pro Extremely versatile stations
Unlike other music streaming services, Pandora allows you to create a station from a single song, artist, album, or genre, and the service has a huge library of over 800,000 tracks from 80,000 artists.
More importantly, Pandora lets you mix and match an unlimited number of input criteria to create a station for any mood/style/occasion.
Pro Available on mobile and in vehicles
Pandora has an application on all major mobile platforms, including iOS, Android, and WP7. In addition, it is available in numerous vehicles as an add-on, many with voice commands.
Pro Predicts what you like with great accuracy
Pandora's music genome algorithms are eerily accurate to the point where it can be considered a personal DJ.
Pro Free
Being available for free means anyone can try the service in order to see if it appeals.
Pro It's the digital version of that friend that knows music better than you and also knows what you will like
A go to source when you want to hear something new that you will like.
Pro Premium Streaming
Premium is just like any other paid streaming service for the same amount. It does the same things and has a a comparable library. With the personalized radio it makes it a force that is often overlooked.
Pro Curated music streaming service
Actual human beings take time to decide what should be played, and on what stations. Sometimes people curating these stations are professional DJs who have experience in curating music content. This makes the music streaming service feel much more organic.
Pro Large music library
Offering such a large library ensures there is enough music of different kinds to appeal to anyone.
Pro Algorithmically generated stations
Stations are created based on an artist, album or track. Slacker then recommends tracks to the user who can either upvote or downvote them, and Slacker will follow suit and recommend tracks considering how the user voted.
Pro Low cost subscription
There's a mid-tier subscription of only $3.99 and a full subscription of $9.99
Pro Works on a large number of platforms
Web, iOS, Android, Windows Phone, Blackberry are all platforms that Slacker will work on.
Pro Streams for free on T-Mobile
Pro Allows downloading stations locally
Easily save music for offline use by downloading the tracks that you enjoy.
Cons

Con Not available outside the US
For those that live outside the US, the service is not available to them, which greatly limits users from around the globe.
Con Limited bitrate
Most songs played on Pandora Radio are 128 kpbs bitrate. That being said, the paid version of the service offers songs with a bitrate of 192 kbps.
Con Limited skips
Pandora makes it very difficult by limiting your playlist to only a specific song or artist. The player also does not allow you to rewind or repeat any songs.
You are only granted six skips per station per hour, and even this is limited to 72 skips per user per day. This is often frustrating if you are trying to focus your playlist on a very specific music selection.
Con Rips artists off
Only Youtube pays artists less than Pandora. Spotify has been under fire for not paying artists enough, at $0.0044 / play (as of march 2018). Well, Pandora pays less than 3 times that! ($0.0013). Tidal pays artists roughly 10 times more ($0.0125).
Con Frequent advertisements
The free version of Pandora has frequent audio advertisements that are injected every few songs, making the service impossible to use in a party-type setting. However, these can be avoided by paying for the premium edition or by using other ad-blocking software.
Con Limited artists
There are only 1 million songs on the service. This means there are a lot of artists missing.
Con Rather intrusive ads
While it's understandable that the free tier will have ads, between video, audio and banners, they can be quite intrusive.
Con UI is too focused on social media
About half of the UI wastes space on social media info posted by Slacker Radio hosts and DJs. Basically advertisements (but different from their regular advertisements), but in a social media setting.
