I considered the Transporter when it was first released but felt that an opamp based output section was a weak point. As James Tanner has repeatedly said, it is more important how the analog output and ground planes are implimented more than the actual percieved pedigree of DAC chip used. From the reviews I have seen of both units, and my experience with the BDA-1, my opinion has not changed. FWIW, the Red Wine modded SB3 works well with the BDA-1. I would expect, though, that the BDP-1 would be an improvement, and should be at over twice the cost.
The interesting comparison is when you use the Transporter as a transport into a DAC (and a BDP-1 into the same DAC).
Then we are discussing the merits of just the decoding engines. The interesting things are:
1- They both cost about the same (~2k)
2- The transporter has custom firmware whereas the BDP-1 uses a pre-existing Operating system and sound card (although breathed on with the Bryston magic)
3- The transporter is TCP/IP based whereas the BDP-1 is USB based
4- The transporter has a boat load of facilities whereas the BDP-1 is very focused
So completely different ways of achieving the same ends.
Peter