When comparing Freesound vs Kenney Assets, the Slant community recommends Kenney Assets for most people. In the question“What are the best sources of royalty free game assets?” Kenney Assets is ranked 1st while Freesound is ranked 5th. The most important reason people chose Kenney Assets is:
All game assets are public domain licensed, which means they're completely free to use in both personal and commercial projects. Attribution isn't required.
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Pros

Pro Creative Commons licensing
All assets made available through Freesound are required to be licensed under either CC0, CC-BY or CC-BY-NC.

Pro Extensive asset information
Each sample has a details page which includes a waveform view, a full-length audio preview, user-assigned tags, author-assigned "pack" grouping, and an author chain ("remixes and sources") for derivative assets.
Pro Public domain license
All game assets are public domain licensed, which means they're completely free to use in both personal and commercial projects. Attribution isn't required.
Pro All game assets are completely free
All of the 20,000 game assets available on the site can be downloaded for free, they require no sign-up.
Pro Packs can be combined
The various packs all have a similar style which makes it easy to mix-and-match various asset packs to create a complete game.
Pro Original vector files also included
This makes it possible to re-save these assets at any resolution needed.
Pro Nice and beautiful
Pro Wide array of asset types
The game assets come in package with 2D sprites, 3D models, audio files, fonts, UI elements, textures and full game sources (Construct).
Pro Assets can be filtered and searched
Game assets can be filtered (by type, tag) and searched through.
Pro Friendly reddit community
New releases, pack requests and help with the site can found on r/kenney.
Cons

Con Some assets may have restrictive licenses
Freesound permits uploaders to select the CC-BY license, which disallows the use of DRM, and the CC-BY-NC license, which disallows commercial use entirely. Licenses are prominently displayed on an asset's details page, and represented by a small icon in list views, but there is no option to filter by asset when searching or browsing.

Con Audio samples and sound effects only
Freesound does not host any kind of non-audio asset.
Choice of music is also scant.
Con Large gaps between new asset releases
Because just two people are creating assets, Kenney and his girlfriend, new asset releases can have gaps of up to a month.
