Without knowing what your looking at model and brand wise….
Anyway, the geo changes between current bikes and bikes several season old may or may not be a deal breaker.
If your after a big rig for smiles and used to older steeper geo then go for that.
If your after a big rig, and intend to compete in races then get the modern bike…..if you get on with the long low stance, low bb height and slack angles.
A point of research for you.
If you have contacted/enquired after a bike and have the sellers real name 🙂
Pop over to http://www.rootsandrain.com type the sellers name in and it will bring up there BC/UCI race history and also a gallery of any race photo’s.
So you might find matching images of bike for sale being raced and dates of races.
Handy little research tool there 🙂