I've used TurboTax, H&R Block, and TaxAct software in the past, before switching to freetaxusa a few years ago. The major difference is that Freetaxusa isn't constantly trying to upsell you into different products, or starting you out on a "free" tier and then 80% of the way through saying actually, you need the paid version, or you need to pay extra to efile, or something like that.
The dirty secret is TurboTax will tell you to upgrade to Deluxe Professional Premium, but you can just access the forms directly and enter the numbers if you need to.
