Having trialled about every genealogy program there is, GEDitCOM is (in my experience) streets ahead of the others. So much so in fact that it turned out to be a "one-horse" race.
Fast and immensely powerful, with an intuitive interface which can be fully configured to suit the user's own needs.
Only criticism I have is that the extensive documentation (300+ pages long) seriously lacks illustration, allowing the reader to get bogged down in technical jargon. However, this only becomes a problem IF you decide to 'tweak' the already adequate interface.
Leaves (the much over-rated and over-priced) 'Reunion' eating GEDitCOM dust. If you want something that runs like a Mattel toy, go for the others. But if you're serious - JUST TRY THE DEMO! A superb app...