How ever as I've begun to love shotguns and appreciate them I've found that gut busting her with an invective or a reforged dry rot with solar damage and full auto will actually bring down her health at a pretty good pace. But the first time I did will of Crota my fireteam took more than 45 minutes on the boss fight and we never once had to restart it

Valus is still a bullet sponge. But he's less bullet spongey. Now if we wanna talk bullet sponge than you have to mention omnigul. She is the literal queen of being bullet spongey

I honestly can't say who would win because I never fought either of those bosses.