I will say this - the renderings are certainly a lot nicer than the model photographs that Jono had.
I got the feeling that perhaps the model may have been a rush job for the downtown summit (I noticed some of the floors seemed a little uneven). It looks to me like the colours of each building are a little different.
The BMO building is interesting but design wise, I like the RBC one. That's just me.
I've worked in the Dominion public building 3 summers in a row in university - the inside atrium of that building is amazing. I remember watching fireworks from the 7th floor (I think) where the Regional Director of PWGSC's office was (Public Works/Government Services Canada). I worked on the ground floor on the side that faces George street. Oddly enough, my boss at the time was named George!