They're both fine bikes, well presented, and the prices are reasonable. The wheels are mismatched on the cannondale which would drive me a bit nuts but it may not matter to you. The cannondale is the more expensive bike of the two. You may find the trek to be more versatile as it has eyelets and rack braze ons. I'm partial to the trek. I just built up a vintage trek 400 for my daughter (an '85) and thought it was a very sound bike. Also with old bikes (and this may be a bit of an unjustified prejudice on my part), I'd rather have a steel frame.