The question is do you want the fighter jet for ground attack or it's over all capability. The SU 35S is lighter, faster, more agile, has a better radar, has stronger engines, greater range, & smaller RCS. In a Air to Air battle the SU 35s will prevail over SU 30 MKI.
As i said, su35 is a SLIGHTLY better air dominance fighter than Su30mki but Su30 is a massively superior ground bomber.
As for weight, on mtow, Su30mki and Su35 are both identical : 34.5 tonnes.
For range, on full internal tank Su30Mki has range of 3000kms, while su-35 has range of 3600 kms.
Yes, its greater, but how often do Fighters actually fly to their max range in combat anyways at that long distance ? to my knowledge, air dominance action 1500km from airfield is rare scenario and in that, air refuelling negates the loadout factor.
You are correct, Su35 has significantly better radar signature, but both are pretty visible to one another anyways.
As for radar- well radars can be upgraded if you got the power-output for it.
Su35 is also a bit more agile than the Su-30mki but in combat operations, Su-30 being twin seater and su35 being single seater does narrow the gap a bit.
Both planes are hyper-manueverable, i highly doubt their difference in manueverability will actually matter in head to head because i dont think humans can tolerate the max manueverability modes of these machines in the first place - we cant do more than 9Gs and these airframes can actually pull well over 12Gs in thrust-vectoring manuevers.
Su35S will have a longer shelf life than Su-30 as air dominance fighter, that is true, but once its role for air dominance is gone, it will go obsolete a LOT faster, since it wont be useful in a air to ground role as Su30 would be.
What i am saying, is Su30 will easily out-survive the Su-35 and pretty much all non stealth planes except the F15 maybe, because ability to deliver 11.5 tonnes of hurt in hyper-manueverable jets that can go 1600km combat radius is nothing to sneeze at.
When Su30mki goes obsolete in A2A roles, it will find a new life as Jaguar replacement. Su-35S or Rafale, wont because once they go obsolete in A2A roles, they are done.
