Mac Chess Software

Is there much difference between Chessmaster 9000 and Shredder Chess for the Mac?  I do have shredder on the iphone which is nice, but Chessmatser has better marketing ;-)

Or is there something even better for the Mac?  I care less about a few rating points in chess and mostly about usability and the ability to analyze positions.  Good training and a database would be welcome.

My understanding is that, if strength isn't top priority, then Chessmaster has lots of features, a built in database, and a general bang-for-the-buck advantage - it's very inexpensive.

It seems better packaged and marketed for sure.  Does chessbase/fritz exist for the Mac too?

There is not a Mac OSX version of Fritz, but, from what I've seen, it runs under Crossover Mac withot too much troble.