My reviews of TurboTax Premiere 2011 and H&R Block at Home Premium 2011 are now up at Macworld.com.
Both applications are very good at making sure you get your taxes done right, although TurboTax gets a slight edge for its simplicity, thoughtfully designed interface, and how well it takes a complex tax code and makes it understandable.
Overall, either application should help you get your taxes done right.