Originally Posted by sestivers
Theoretically, the Ultegra 9s would cost less than the 105 10s. So if the overall price of the bike is the same, you're theoretically getting a better frame/fork/wheels/something else.
Of course, in theory, communism works too.
Actually, they are priced within $50 of each other on a full build kit from the best source I know of -
www.gvhbikes.com. Other parts spec may vary a little by build kit, but I view the overall value of each to be equivalent...