Both the Hoover WindTunnel 2 and 3 can do the task of cleaning surface dirt or deep cleaning your surfaces. However, the major difference is that while the WindTunnel 2 has only 2 channels of suction to suck in the dirt, WindTunnel 3 has 3 suction channels. So, in some cases, the WindTunnel 3 may indeed, do a better, more powerful cleaning as it has more power dedicated to suctioning the dirt.