I haven't used them all but this year I'm using Turbotax since it can pull your information for your W2 and 1099-DIV/1099-INTs electronically from your employer and banks. Makes it much easier!
Last year, I used Tango by H&R Block which worked surprisingly well. The one item on my wish list which Tango did not have nor did any of the other online programs I found online last year was the ability to handle an active trader's buying and selling of stock. Since I made several buy and sell transactions at variable amounts, meaning I bought 1000 shares and sold those shares of in lots of 200, the program can't ingest those transactions. This resulted in me having to spend hours manually determining what to report to the government and at what rate (short term or long term).
If you find of any online tax preparation software that handles such a situation, please let me know.
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