Neither argument is inherently more compelling; Each and every person will have their own individual preference. The good thing is there is a rule on p.6 that deals with this “The DM narrates the result…”.Add your Structure modifier for the amount rolled and reduce the damage by that total. You should use this trait a number of times equal to

A ritual to summon a nature deity needs the players’ assistance, involving accumulating rare components and defending the Firbolgs from interruptions by hostile forces.Conveniently, fighting spirit works by using a bonus action when stone’s endurance makes use of a reaction, so you can also use it all in the same turn!Via GeekDad.com I’m comp