Well, you do not need issue invoice with EU VAT , which is already a ~20% (depending your EU country), yo do not need to do complex accounting every few months, but once a year, and depending on your country you will save some monthly fees for being self employed. I thinks that's quite a lot of "savings" already 🙂
Regarding income tax, yes, there won't be any savings there, but I see a lot of other advantages here.