I have both
Injection allows for more aggressive leaning and LOP operations if you balance your injectors. As stated above, you get what you get with the Ellison, just like a carb.
RV6-IO360, lean to 50 LOP with EGT, or lean to significant loss of power (never does get rough) enrich slightly and, bam, you get the same thing.
Bucker - O320, lean to roughness, enrich slightly, and based on my one EGT, that is around 75-100 ROP.