Depends, on what you want... I started with the Apple case, but didn't like it; too flimsy. Switched to Otterbox Defender, heavy duty, but also very heavy, negating one of the iPad's advantages..light weight & easy to handle. Switched to Incipio and liked it real fine except for no protection for the screen when carried, or otherwise not being computed on... Now I have the Zagg with BT keyboard and like it Real Well. Good protection for the screen when not computing and easy setup for the keyboard's use if you don't want to use the on screen keyboard..
HTH
Take Care