She'd be more sadistic. More merciless. Thanos has a pathos all his own. He explains himself on the battlefield, sympathizes with his victims, consoles them as he kills them sometimes. There's a clearly defined method to his madness. If we're being honest, I think Hela would revel in doing the job herself and just use the IG as a booster rocket in battle.
It's all glory in battle and death, but to what end? The accumulation of riches? Bragging rights over the other kingdoms? Thanos is a character with fleshed out motivations I understand. Hela is more of a symbol, and idea. Just a Tasmanian Devil tornado of indiscriminate destruction.
With that in mind,
1. She'd kill the Guardians in Nowhere. Probably to make examples of them.
2. There would be less back and forth in a fight on Asgard. Although it's possible that Iron Man's wits might be more with him on Asgard and he might develop a better plan. Maybe it's wishful thinking on my part, but Strange should open a portal, negotiate her half way through and close the portal. If it doesn't cut her in half, well that's unfortunate.
4. Cap's team I think would fare fairly well against an army of undead Asgardians in Wakanda.
5. If 5-stone herself shows up in Wakanda, expect pain. BUT it's my belief that instead of trying to remove the stone from Vision, they should work on repairing his incision. With Vision, I think they could take her. I think Stormbreaker could kill her in one shot.
She'd be less merciless, doesn't get paid by the speech; there's some killshots I think she would take quicker. Starting with Drax and Mantis at Nowhere. Part of me hopes the moment she acquires the soul stone, she kills the Red Skull too. For showing up in the movie.
Overall: She's more of a plague and a cancer than Thanos. She's not interested in watching the sun set on a grateful universe. She was already near Odin-level dangerous before Thor was born so who knows at what age she'll begin to slow down. Who knows if she'll ever get bored or tired.
Bonus: Equally screwed.
So maybe they could rework the plan against Thanos on Hela, get the IG off her arm, toss it to Thor, Thor snaps his fingers and she disintegrates. Thor deposits the IG in the center of the nearest star and that's a wrap. The only casualty is Darcy, who was struck by a car back on earth for unrelated reasons.