I don't understand much about bike geometry, and was wondering if someone who does could compare these two bikes and give me feedback. The first is a 2011 BMC Streetracer, which I own in 57 cm size:

http://www.bmc-racing.com/int-en/bik.../standard.html

The second is a Cannondale Synapse. I'd guess a 56 would probably fit me (I'm 5'11", with a cycling inseam of, I think 34. Pants inseam 32. I wear a 34/35 sleeve length dress shirt.):

http://www.cannondale.com/2013/bikes...mpact-crankset


Basically, I'm wondering if anything about the Synapse geometry makes it a more 'relaxed' bike than the Streetracer. I love the BMC, but I get neck pain after a while. I've tried different bars and stem, which helped, but I'm still not there. I'm considering an even higher stem, but wondering if I just need a new bike. Of course I need to ride more, get in better shape, and HTFU, but when I ride my Kona Jake I don't seem to have this problem. TIA for any help.