In aeronautical terms Su-35 is better. Even the RCS reduction is very commendable.Thanks for the compilation, SU35 seems marginally better
However the J-15B might have an edge in avionics and weapons systems. Having one of the most powerful AESA radars in service, it has the added advantage of being an LPI sensor in addition to it's range. There are rumors in Chinese forums that some Chinese Su-35 are being modified with Chinese radars, EW suite, mission computers and weapons systems.
Su-35s only drawback is it's PESA radar. Which is not as resistant to jamming as an AESA radar. Also, it is not a true LPI sensor but better than a mechanically scanned array.