It's definitely a trade-off situation.
The table here shows my observations about the trade-off.
I am guessing your word "disturbated" is supposed to be "distorted" - this is very likely a device + sound file specific issue. If it is custom audio files, consider changing them to .ogg format.
As for Crosswalk, try reducing the size of your files. Loading times depend on your device speed and the file size.
If you want my advice about the trade-off, I'd pick WebView as Crosswalk is no longer in development, but WebView always receives updates and fixes, which any WebView app will automatically take advantage of. As new devices get released, WebView will become the better option as its weakness is lack of compatibility with older devices.