To be honest, I've never heard a convincing MIDI emulation of some instruments -let's say, a tenor sax-, with all its subtle nuances and multiple playing techniques. On the other hand, Realtracks sound simply great, and with the proper tools you can edit audio material nearly as easily as if it were MIDI data. Although I still use some MIDI tracks (this new feature of 2012 is really great) in combination with RT when I need specific patterns, to me there's just no comparison between RT Styles and MIDI styles. Just my two cents.