When comparing Cortana vs Resonic, the Slant community recommends Resonic for most people. In the question“What are the best power user tools for Windows?” Resonic is ranked 21st while Cortana is ranked 48th.
Ranked in these QuestionsQuestion Ranking
Pro Can recognize music
You can ask Cortana what music is playing and she will attempt to identify it.
Pro Will let you know when artists you're interested in play in your area
Cortana monitors your Bing search history, social network actions, music played, etc to find out what are your favorite artists and will let you know if they plan to play in your area.
Pro Clean interface
Pro Portable version available
Pro Pure sound
Pro Has a waveform seekbar and analyzers
Has a big single-click waveform seekbar and three real-time analyzer visualizations by default.
Pro WASAPI/ASIO support
High-end audio cards can be easily used to their full potential without any additional software due to WASAPI (Player and Pro) and ASIO (Pro) support.
Pro Supports all formats
WAV, BWF, RF64, AIFF, AIFC, FLAC, APE, ALAC, WV, TTA, DSF, DFF, MP3, MP2, MP1, M4A, MP4, AAC, MPC, MP+, OGG, OPUS, SPX, WMA, WMA Pro, WMA Lossless, MP4, WMV, AVI (certain codecs), MID, RMI, KAR, IT, XM, S3M, MTM, MOD
About 8 MB, and about 11 MB with the integrated Soundfont for its MIDI playback synthesizer. Native application, no dependencies (no .NET runtime).
Pro Most actions can be done with a single click
Most actions can be done without having to double-click. Things like navigating folders, playing files, seeking audio, changing volume are all done with a single-click.
Con Functionality is limited on non-Windows devices
While Cortana is available on Android and iOS, certain features on those operating systems are either limited or non-existant. For example, there's no hands-free voice activation on iOS, and on Android it's only available on the homescreen and nowhere else, etc.
Con No playlists
Or not yet, at least in the forums they say they're working on it