Giant TCX SLR 2 sizing vs Trek Domane 2.3

Hi everyone,

I'm newer to biking and have bought all my bikes online after doing some research and trial and error in terms of sizing. I'm 6', 32-33" inseam and a 75" wing span (arms are a little long for my height by an inch or so each). I'm currently riding a 56cm 2013 Domane and find the fit...