Who was/is worse, GW bush or obama?

Bush screwed up a lot of things. Katrina, the war in Iraq, WMD's, the Mission Accomplished Banner, the Economic Crash of '08, etc. But overall he was personable, and did try hard to do his best for the country. Obama on the other hand is less experienced, a little more radical in his policies, and has made some questionable decisions. What do you think, who was worse?