Originally Posted by bahula03

Like others have mentioned, the EW-RS910 requires bars that have holes to route the wires, so you're constrained by that for upgrades/different sizes. Some manufacturers will use the EW-RS910 and route the wires through both the bars and stem, which means having to find both components that are compatible. None of it's a big deal really, just preference on what it looks like, supporting components, and how easy/difficult it is to install.