Even if Luis was inadvertently measuring the core DD or DTS tracks on the Blu-ray disks, they would almost certainly be higher bit rate. Because Blu-ray has so much more storage capacity, even the lossy streams are typically encoded at the codecs' maximum bit rates of 640kbps for Dolby and 1.5Mbps for DTS. On DVDs, DD is usually choked down to 448kbps and DTS to 784kbps to save space. The maximum bit rate for TrueHD and DTS-Master Audio is 18Mbps, the same as uncompressed PCM.
Short answer, the lossless formats do sound better -- in a decent system, in a decent room, at near reference levels. But I think you'll be perfectly happy with core DD and DTS in your application, Ken.