You can complete all the raider quest line at Nuka World or wipe them out right away long ad you don't establish any Raider Outoost in the Commonwealth Presfon will remain on good terms. He will dislike you being the over boss and if MacKenzie didn't give you "Open Season' it will prompt Preston to only thing you gain from giving rhe Park to the raiders is their unique perks depending on which hangs your favor and Gage's unique perk upon max bonding.However it's possible to kill the raiders immediately after killing Colter,and completing Nuka World with normal companions still gaining rewards from quest such as Oswalds Hat,Sword of Wonders,Citos Slugger & Nuka Quantum power armor, etc. Only certain raiders armor won't be available such as the heavy pack armor as it will be quite rare to find