I train on a 2013 Giant TCR Advanced ISP that is a very nice bike. Just handles and rides wonderfully:
I race on this crappy 2015 Venge Expert with 105. It has all the aero bits and is a little faster at speed in a straight line, but it's creaky, handles poorly compared to the TCR and generally pisses me off:
Thinking about replacing the frame with a new Allez Sprint and maybe getting some Sram on it or something.