DASH is more a protocol to make many quality levels available in a single stream in a standard way. You could add a Pied Piper track to a DASH stream easily.
A more relevant comparison would be HLS, Apple's HTTP Live Streaming tech, which works really well but is not very widely supported.
There are over 800 million devices that support it.
Works really well, yes, but it has considerable latency for real time video.
Apple's HLS and MPEG-DASH share the same design principles. One big benefit of MPEG-DASH is that it is supported natively within HTML5 using the HTML5 Media Source Extentions. However, today HLS and MPEG-DASH are used in common.