I have 105 on one bike and Force on another. I love the double tap of the Force but the 105 is a lot smoother shifting. The shimano will run quieter than the Sram. Either will shift gears better than what you have. I will buck the normal trend on here and say go shimano but I've had bad luck with warrantee work with my Sram and oh yeah the parts breaking requiring the service. Don't fall into the Sram can be fixed, if that was the case I would have only waited 3 months for parts not a new shifter, good thing I had my other bike with good relible Shimano...