Coke vs. Pepsi

I'll choose whichever one pays me more, allows me to live where I want to, and gives me the best career progression. Other than that, they are the same thing. Small differences that amount to very little.

Anyone that chooses their airline based on CRJ 200 vs. ERJ 140 is foolish. CRJ 200 vs 170/190 or CRJ 900 vs Q400 is a completely different argument...choose the airline that has airplanes that will still be flying in 6 years.