Yoda could utterly destroy both Obi-Wan and Anakin very quickly with his awesome lightsaber skills. Galen doesn't stand a chance against either Yoda or Palpatine. It doesn't matter whether they are in Mos Eisley or out in the desert; team one would still get annihilated every time.
Now, a harder one to figure out would be if Yoda and good ol' Palpy then turned on one another, and THEY had to slug it out...