Have you heard any/all of them or tried any in your own system? Do you own the YGA Carmel 2 speakers you discussed in another post. Those have low’ish efficiency and probably need some power to push. These choices are so subjective and also can be dependent on your system and the types of music you listen to.
Ideally you will hear from someone who has heard several or all of your choices. I have not, but I did own the Tambaqui a couple of months ago. IMO, it basically sounded "perfect" but maybe too perfect and too precise, for me at least. I did not use the I2S input, but I did play with the output voltage. It has enormous flexibility so may have the ability to be "dialed in" more so than some others. It did absolutely nothing wrong, but didn’t quite engage me as much as others. However, that opinion easily could have been on me related to not having an optimal set-up.
I owned a LaScala some time ago, but not the optologic version and it was ok but nothing that overly excited me. I have not owned one of the more expensive Lampizators but the lower level model I owned displayed a really nice tone and an expansive soundstage (maybe too much). The Terminator and Plus have been reviewed multiple times at Six Moons and elsewhere so their sound is pretty well documented. I have not owned one, but I did own the Hermes DDC (step down from Gaia) and I appreciated what it did. I currently use a Singxer SU-6 DDC which, like the Hermes, provides some subtle benefits in addition to providing additional connection choices.
Unfortunately, reading about things and opinions are never the same as hearing for yourself. Good luck.