The user interface and the question-and-answer format of TurboTax is simply the easiest to understand. The drag-and-drop file feature to upload W-2s and other standard tax forms is easy and saves users from having to manually enter. The way that extra information related to each question can be clicked and expands into side panel is just a brilliant way to get a better idea of what you're being asked. I tried Tax Slayer first this year and switched over to TurboTax even though I was a third of the way done in Tax Slayer. The Slayer user interface nearly slayed me, so I abandoned ship. Glad that I went back to TurboTax!