Not everyone prefers to live on the bleeding edge. That is why Chrome users who favor reliability over experimental changes undergo a waiting period of a few weeks until said changes can be incorporated safely.
Well, the waiting may not have been worth it this time. An update bumps Chrome for Android up to version 38, but perceptible changes are few.
Material design tweaks, new battery and orientation APIs, and “lots of bug fixes and performance enhancements” are the only improvements mentioned by name in the official changelog.
Still, if behind-the-scenes work was substantial enough to merit a new version number, the latest Chrome is probably worth downloading.