I know this has been asked 1000 times on this site alone, but nothing seems to help me on my situation.
I am currently training for a 150 mile, 2 day, charity ride. As I have never road this much before, I need a little insight. Right now, I have a 2007 Specialized Allez Double (switched out for compact crank). It has an aluminum frame with a carbon fork, and I put on 700x28 tires to help with the comfort. My question is if I will be better off with a steel frame, rather than what I have now. I am not looking for a big speed advantage. I mostly want to complete the ride, and all the training that goes with it, in as much comfort as possible. I should also mention that most of my training is city riding, and about a 10 mile bike commute.