Witcher 3 question

So I've decided to get Witcher 3 never bought or played from this franchise before. If I buy the goty edition which is £25-£30. Compared to the standard normal version which is around £16. However I need to trade in tekken 7 which I'll do at game and get £30 cash roughly. I was going to buy the game from game itself but eBay have a better price including the goty version for just £20. Does the goty have every dlc available? And is it worth getting