Military Watch says the two fighters are significantly different. Lockheed Martin F-35 is a light aircraft with lower than average maneuverability. It was designed as a lighter and less costly complement to the elite F-22 Raptor air superiority fighter, a platform no longer in production.
The Su-57 by contrast was designed as a heavy air superiority platform and is more capable in an air-to-air combat role, adds Military Watch. The analysis gives advantage to the Sukhoi Su-57 in its speed, altitude, sensors, missile carriage, engagement range, and maneuverability.
It also reminds its readers that the US Senate adopted the 2019 draft Pentagon budget that would terminate Turkey's participation in the Joint Strike Fighter (JSF) program. The act would also ban the transfer of rights to F-35. Among the reasons for the move is the threat that Turkey might share the data on F-35 Lightning II following its purchase of the Russian S-400 surface to air missile system. Turkey responded by promising to buy Russian made Sukhoi Su-57 instead of the US fighters.
According to Military Watch, in this case the Turkish air fleet would be more dangerous than it would have been if Ankara purchased the US stealth fighter. Fifth generation fighter benchmarking is a routine exercise for Western media. Domestic authors have tried their hand at it, too, but it is not that widespread in Russia.