I can't comment on the Bryston BCD-3, or the Technics SL G-700, but I do own a Technics ST G-30. The sound is excellent & the build is beyond reproach. All you really need to do is count off what really matter's to you. The Bryston is not SACD, the Technics is. The warranty on the Bryston is not the famous 20 year, it's 5 year, same as the Technics. I know where you can pick brand new SL G-700's for $2,999, I'm pretty sure the Bryston goes 3,764, or somewhere near there. I know I was interested in the SL G-700 myself. Either that or a good used PS Audio Perfectwave CD Transport. I'm surprised your not thinking of a Perfeçtwave CD Transport yourself if you haven't already chosen yourself, I know I'm a little late chiming in. If you haven't then read up on on the PS Audio Perfectwave CD Transport, it's SACD and I2S through HDMI output enabled. Either way, good luck, & happy listening.
JJG