I personally used TurboTax the first few years I had RSU and ESPP income to report (and ran the end result by an accountant) but eventually switched to filling out the forms manually because I found it easier than entering the same information into TurboTax. Tax prep software is great for when your taxable circumstances change and you don't even know which forms you need to fill out, but I didn't find that it let me skip understanding the relevant parts of the tax code and I got to the point where I was having to generate preview pdfs look over exactly what it was generating to make sure I'd entered numbers into the correct spot in the software.