My Dyron +7 had lots of chromatic aberration and was not terribly sharp near the edges. My CMC has very little to no CA and is sharp across the whole frame. Color rendition seems (probably only in my mind) better too.
I don't think anyone has done exhaustive testing of the two strobes in the same conditions and the S&S strobes have not been out for long enough to make any kind of statistical argument. From anecdotal evidence (and I know that the plural of anecdote is NOT data) it appears that the Inons are more reliable but for every one with a 10 year old Z240 Mark 2 there is a YSD1 with multiple thousands of flashes.
Physics is physics and you can't change the way that diopters work. Working distance with a strong diopter is dependent on the design of the diopter but with the CMC for example you still need to be very close. Optically (at least in my hands) the CMC is way more better than the Dyron, but the physics of the setup don't change much.
The sirius is nice but not very bright, the GN is only 5.6 compared to 11 or so for YSD1.
I am not sure about the duration of the flash, the translation says it is "arbitrary" and the number of guaranteed flashes is 1000, I assume that is a battery capacity not a full on design issue, if it is then each flash cost $1.