Which is the best automobile for someone to buy?  Single person?  Married couple with 15 kids?  Construction worker that hauls a half ton of materials each day?  One size doesn't fit all for a vehicle and it doesn't for a tax software either.  Is the return so simple that it could easily be prepared manually or is it so complex that it would take forever and a day to do it manually?  Depending on the complexity of the return, is it better to pay for a software package or to pay for a tax professional to prepare the return?  

Or are you even talking about an accounting package instead of a tax package?