I took a look at your Sonnet Morpheus DAC and noticed it doesn’t have a HDMI i2s input so you don’t need a CDT that has one. Knowing that, I’d like to refer you to this Audiophiliac video from Steve Guttenberg,
He goes onto say that comparing Coax and Toslink of the TEAC to a Jay’s Audio CDT2 Mk3, it was a toss up and only when using the Jay’s HDMI input did the Jay’s pull way ahead. It does cost more than the SMSL I mentioned earlier but Steve feels it's a very well made CDT.
Hope this helps and good luck with your search.
All the best,
Nonoise