I would say that the su 27 and the f 15 is more or less the same, none are superior to the other. I mainly fly the su 27 and sometimes it happens you see me flying the bloody fast mig 29s , and i've downed plenty of f 15 , and got downed plenty of times aswell. BUT flying the su 27 against a F 15 you need to be dam good at missile avoidence techniques , thats the only way you can defeat the f15. you dont need to out number it, just need to know where in the sky those pesky amraams are, and keep your eye on the RWR. Im not saying its easy, beacuse its not, but its so much more rewarding getting a kill when facing the enemy all the way and dogding a couple of missiles doing it. Or acutally scaring the F15 and getting it to run back home with its tail between its legs. just as satisfying. ;D
Now, i've never bothered to learn how to fly the F 15 . I dont know the weapon systems nor how the missiles preform, so i've actually never gotten a kill in the f1 5 beacuse i've never flown it in combat. But as i mentioned earlier , i dont feel that either of them are superior to the other. When 1 f15 meets a Su 27 , they wont know whos going to survive, its not like the f15 is going to be victorius everytime.
We have to keep in mind that it all depends on the pilot!!! , not the airframe or missiles.!!
thats just my 2 gold nuggets