Wireless Mesh or just renaming accesspoint

I'm a newbie for these kind of things so forgive me if I say something wrong :) suppose we have 3 access-points and they all have physical cable back to server, I want to have 1 expanded network (SSID="MyWirelesssNet"). so what is the difference between using full mesh WDS or just rename all of the APs to "MyWirelesssNet". what is the best method?