When comparing IndieGameMusic.com vs Unity Asset Store, the Slant community recommends Unity Asset Store for most people. In the question“What are the best sources of royalty free game assets?” Unity Asset Store is ranked 2nd while IndieGameMusic.com is ranked 13th. The most important reason people chose Unity Asset Store is:
Those who have downloaded an asset can give it a rating (5-star system) and optionally a written review. Packages with at least four show their average rating, and total number of ratings. (Packages below the threshold show "Not enough ratings" instead.)
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Pros
Pro Exclusive licensing available
Some tracks are available for exclusive licensing. They become yours alone, and get removed from the track listing.
Pro Supports asset requests
IndieGameMusic.com provides a searchable database of musicians available for project work.
Pro Comprehensive tagging and search facility
Tracks may be searched by artist, genre, mood, license, file type, license fee, and other criteria.
Pro User review system helps gauge asset quality
Those who have downloaded an asset can give it a rating (5-star system) and optionally a written review. Packages with at least four show their average rating, and total number of ratings. (Packages below the threshold show "Not enough ratings" instead.)
Pro Excellent presentation, organization, and search
The Unity Asset Store is well-presented, with an intuitive category system and effective search. In addition, the requirements to place an asset on the store include providing several standardized graphical and descriptive elements so that individual packages match the same presentation standards as the store itself.
Cons
Con Some assets may have restrictive licenses
Hosted tracks are permitted to enforce a Freeware license, which restricts their use to freeware projects only. The search system allows filtering by license. Track listings are visually tagged with available licenses.
Con Music only
IndieGameMusic.com hosts only full-length musical compositions, not sound clips or assets of any other type.
Con Unity3D license required to download assets
Though assets may be browsed through the web, they can only be downloaded from within a licensed and registered copy of Unity3D (Free or Pro). However, once downloaded, the Asset Store EULA does not prevent using them in non-Unity projects so long as those projects match the "games and interactive media" description.