I think like all components of the audio chain they are system dependent and more importantly listener preferences.
I've compared the Cobra ztron with the Python cx and the Anaconda cx with the Python ztron. I preferred the cx combination. In my system the Cobra was indeed faster, livelier, but lost body and bass. Soundstage narrowed and presentation became forward. The difference of the cobra with Python cx is very evident from the start. Comparing Python ztron to the Anaconda cx I found the ztron to sound bigger, more bass and body but slower. Bass is not as tight as Anaconda but soundstage wider and deeper. Overall slightly darker sounding. I heard more details with the Anaconda.
I say system dependent because I use cx all the way from source to amps so that may have contributed to the presentation I heard. If I compared the all cx system with an all ztron system perhaps my findings will be different.
Which ones are better? Who knows. Only you can decide what kind of presentation you like.
I've compared the Cobra ztron with the Python cx and the Anaconda cx with the Python ztron. I preferred the cx combination. In my system the Cobra was indeed faster, livelier, but lost body and bass. Soundstage narrowed and presentation became forward. The difference of the cobra with Python cx is very evident from the start. Comparing Python ztron to the Anaconda cx I found the ztron to sound bigger, more bass and body but slower. Bass is not as tight as Anaconda but soundstage wider and deeper. Overall slightly darker sounding. I heard more details with the Anaconda.
I say system dependent because I use cx all the way from source to amps so that may have contributed to the presentation I heard. If I compared the all cx system with an all ztron system perhaps my findings will be different.
Which ones are better? Who knows. Only you can decide what kind of presentation you like.