Okay, you started to make "sense" then sorta fell apart. The STi and Evo 8 I wouldn't consider it equivelent to the T-Maxx vs. Savage argument. It'd be more like Serpent 710 vs. Mugen MTX-3.
While the STi has a bit more power and straightline speed, the Evo 8 has slightly better handling. On a road course, it'd come down to driver's skill.