Which plane is better?
The Sukhoi Su-35S Flanker-E, an advanced derivative of the original Soviet-era Su-27, is the most capable fighter Moscow has ever fielded. While the Su-35 is primarily designed to be an air superiority fighter, it also has a potent air to ground strike ability.
The Su-35S program has its origins in the Soviet Air Force’s program to develop a modernized Flanker derivative that was to be called the Su-27M. However, with the 1991 collapse of the Soviet Union and the subsequent economic meltdown and chaos in a newly independent Russia, funding for the Su-27M was halted. However, Sukhoi continued development of the Flanker aircraft in the hopes of securing export orders. The design bureau eventually concluded in December 2003 that it needed to completely revamp the Su-27 airframe to make the jet more competitive on the international fighter market. The first prototype of the new jet—called the T-10BM—made its first flight on February 18, 2008.