Question about Intel Core i5-8600K

Hello all, I have put together a PC for gaming, such as for CSGO, arma 3 etc.. My question: Is the pc so well put together or should I change something? I researched for a really long time and thought that the price/performance ratio should be right, but then I saw a pc from medion at Mediamarkt for 2299 francs that is not badly equipped either. (https://www.mediamarkt.ch/de/product/_medion-erazer®-x67083-1878521.html) My question is what would you do to buy the ready-made PC or assemble the one I have put together? https://www.digitec.ch/de/ShopList/Show?shopListId=65DBC28850E34107F6E732985B60BFFC Thanks in advance for the feedback