I've had quite a few Giant compact TCR frames I've built. I'm 5'11" with a 33 inch bike inseam and 25.5 inch arms and I really liked the way the Giant large fit me with a 120mm stem. Sense were talking about you using the same size frame as me and you being quite a bit taller. I would really recommend you taking that bike for a good long ride before deciding. The big negative with Giant's sizing that they only make 4 compact frame sizes to fit everyone.