My opinion?
The 30-year old Schwinn is over-priced 2x and would fit a rider 6'+ tall...and more than likely 6' 1" or better. Sure, a 5' 8" rider might straddle it with the seat slammed and looking like ass...whatever.
Edit: a 63 Cm / 25"? More like 6' 2" or better for a reasonable fit.
The C-dale is also a dated design and no one has anything good to say about the outdated and poorly designed Bio-Pace chainrings. The bike does 'look' fairly clean and perhaps cared for in the pictures, but it's not worth much in my book. Maybe $250-$275 on the high side? Those models rode like bricks and weren't called recycled beer cans for nothing. They made a decent, cheap crit frame until the derailleur hanger got snapped off in a fall.
And possibly sitting on sew-ups?
Either bike will certainly get a guy 16 miles up the road. No problem there. Make certain one of those two actually fits you because they are NOT sized for the same height / inseam by a long shot. Go over the one you buy with a fine tooth comb, mechanically, before setting off from home.
Who knows, some one might pop in and fall in love with the downtube shift levers, the steel frame and the vintage components.
