Ranked in these QuestionsQuestion Ranking
Pro Streams to most live streaming video platforms
OBS can stream to any RTMP-enabled service, including Twitch, YouTube, DailyMotion and Hitbox.
Pro Has over 20 plugins that enhance functionality
OBS has over 20 plugins to choose from, including one's that allow adding video files and any other media supported by VLC as a source, integrating Twich chat and switching scene depending on what window is in focus.
Pro Supports Intel's Quick Sync for faster and more power efficient video processing
Quick Sync is hardware video encoding and decoding technology that's comparable in speed, compression ratio and quality to x264. Since Quick Sync is a dedicated hardware core on the processor die, it allows for faster and more power efficient video processing.
Pro Light resource usage
Pro Supports Nvidia's NVENC
Pro Has a tool that figures out best stream settings
Pro Has an audio mixer plugin
Pro Scene previewing allowed in Studio Mode.
OBS allows to look at scenes before streaming them in Studio Mode.
Con Doesn't work on Windows XP
OBS works on Windows Vista or later.
Con Constantly freezes
Con Can't output to multiple streams at once (planned)
Ability to stream to multiple outputs is planned.
Con Can't link to an audio file as a source
You can download a plugin called DirectShow Audio Source, but you're only given options to use audio inputs (mic, speakers, etc...). You cannot simply select a wav or mp3 file to loop (going AFK or BRB for example).