Check out the interesting competition from the Lifehacker website between his human accountant and Turbo Tax.
The Verdict
Even though my accountant is expensive, and even though I’m no software-phobe, this year I’ve decided to trust and choose my human accountant over TurboTax.com. If you have any doubts, you can do what I did and complete your return at TurboTax.com without actually filing it to compare results against what your accountant brings you.
The nice thing about dealing with a human is that I can (and will!) call him up and ask why the software’s total was different from the one he gave me. Surely there’s a logical explanation.
Check out the complete article (and some pretty insightful comments) here.