The trial is more complicated then just that. Its not about what tank is better.
But which tank best fulfills the army's retirements.
For example the IA has overheating problems with both the Arjun and T-90 in the rajastan desert.
While DRDO made specialized cooling systems for effected systems.
the Russians installed an Air conditioners in the T-90 and said that would do the trick.
Now the Russians are known for their simple solutions, so there system may very well be effective.
But that's what these trials are to find out.
Which on of these tanks can best fit the requirements of the army.
Don't drag the IAF down to the corrupt hole of the IA.
They have neglected in the past. But they fully support domestic industry today. taking an active participation in development programs.
Even supporting RnD in ISRO.
Once they get rid of the old mig fleets, they can focus more in Domestic.
It's not about what is better.
Its about which tank suits the Indian Army's requirements best.
It may be T-90 vs Arjun but the battle is not for, I am better title.
But which tank works better for IA.
That's what this trial is to decide the IA needs a tank that meets its requirements best. Which is that T-90 or Arjun