What's Best for WoW: Forever - Party Buffs or Raid Buffs?

In Vanilla and TBC, Buffs like Windfury are party-only. In Wrath and beyond, most buffs were made raid-wide. Which is better for WoW: Forever, party, or raid buffs?

In Vanilla WoW and The Burning Crusade, powerful buffs such as a Warrior's Battle Shout, a Feral Druid's Leader of the Pack, and a Shaman's Windfury Totem are only available to those in the party of the class or spec offering it. In Wrath of the Lich King and beyond, these buffs were made available to everyone in a raid as well, not just a party. WoW: Forever follows the Vanilla/TBC formula of party-wide buffs, but would it be better for players if these buffs were raid-wide instead?