Just wanted to chime in on my experience with the SB vs Transporter
Technology for digital source is getting extremely good and differences are becoming vanishingly small. Design engineers can only spend so much on power supplies and higher quality components. Often more expensive products just have better features and are built beautifully and expensively packaged - of course they eek out a small degree of less jitter and better channel separation etc. - but differences are often small. What you report is not all that surprising although most people are naturally predisposed to rate the beautifully packaged item as sounding much better.
FWIW - I think the Transporter looks way cool! The build quality and features are awesome. It is worth if for that great look alone as well as the comfort that it is made from very high quality components. May be with headphones you can hear a slight difference?