Have you test ridden either? They're both reputable brands. I haven't ridden either, but I'd lean toward the one the fit best first and foremost, then the components (if they're being sold as complete bikes) second. Color is always an important consideration, too. 
I'm in the process of buying a new bike, and in addition to fit, I made my choice based on the way I plan on using it (and cost, of course). That's another thing to factor in. What are you hoping to do on this bike? Charity rides, transportation, racing, touring, time trials, just plain old rides? Just some things to consider, because that will impact design features you will want.
'02 Eddy Merckx Fuga, Selle An Atomica
'85 Eddy Merckx Professional, Selle An Atomica
'10 Soma Double Cross DC, Selle An Atomica
Slacker on wheels.