Not taking ease of installation as a parameter, for DCC Sound, I choose ESU Loksound decoders for diesel sound and Soundtraxx Tsunami for steam sound. IMHO these two are top-of-the-line for DCC sound decoders.
About two days ago, I watched a YouTube video showing what Soundtraxx Tsunami diesel sound decoders will do operationally that no other sound decoder will do...which is causing me to want to give one a try in my next diesel installation.
You won't go wrong with either of these two sound decoders.
As far as what BLI will do with their "Stealth" models, it's anybody's guess at this date.
Cheerio!
Bob Gilmore