We read a very good article at DigitalTrends about the top 5 music streaming services, and it seems like a fair assessment:

#1: Spotify: Best discovery, big catalog, many new releases, large number of Playlists
#2: Apple: Best for Apple users, good integration with other apps; needs higher quality
#3: Pandora: Best for passive listening, very good curation; not the best user interface
#4: Soundcloud: biggest catalog, withtons of Indie tunes; but music discovery can be complicated
#5: Tidal: higher-quality music than most services, and a big catalog; needs better user interface

T'his list can change over time, but these five are the main ones.  We recommend picking one of the first two for your paid service, play around with Soundcloud, and use Tidal if you have more high-end equipment.  Enjoy!

We are taking a look at a service called QoBuz, they have Hi-Res music.  Its definitely a better experience, and something you should check out.  
 
They have regular music streaming like Spotify or Apple, at $9.95/mo; and two higher quality  streams.     First there is their Hi-Fi plan, at $19.99/mo - it is based on FLAC 16-bit at 44.1khz,   Then they have an even higher quality service called Studio, which is $24.99/mo - it is based on FLAC 24-Bit up to 192 KHz.  The higher quality streams do require more disk space for buffering but are well worth it.  You can learn more about their streaming plants here. 
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In general we are big fans of Spotify but if you have a really good sound system, then Hi-Res music would be a great way to go.  And for many rooms, SONOS speakers are an ideal match with QoBuz!