Bang for your buck, I'd take the EB every day of the week. Faster than the V6, lighter and more nimble, good gas mileage, and with an $8k difference from the 5.0, it could have more creature comforts, or be modded out to be as fast as the 5.0.
If you have a lot of money and don't give a f*ck then the 5.0 is the one, but for the sensible, on-a-budget buyer the 2.3 just seems like a steal in my eyes.
2011 Mustang V6, loaded, 3.31/FRPP/Bama 93R -- SOLD
2013 Ford Focus ST3 - bone stock