But ALL the heralds (no Nova here?) have flight, range & energy attacks, and other powers on top of strength while some of the Avengers like Hulk, Herc, Forgotten One don't. If the heralds chose to stay in flight they would outnumber the flying Avengers and might be able to whittle them down, then take on the ground bound Avengers with a big numerical superiority and range attacks.
If Morg has the WOL powers that is a big boost too.
Sersi is powerful, but I'm not sure if her powers would work directly on heralds, and without that she can be vulnerable if you go by many of her appearances.
On the other hand Thor, Quasar, Sentry & Captain Marvel are going to be tough to put down if they're watching each other's backs and applying some Avengers training & tactics.
I'm tending toward the heralds mainly because of their overall versatility, flight & range but with or without BFR I'm not sure if they can actually bring this fight to a definitive conclusion. A possible stalemate.
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It isn't a BFR. It's simply a device to crush your enemies and Stardust, the Surfer, and Redshift have been shown to have access to them.
Surfer, Morg, and Terrax all have planet busting feats. Stardust cannot be permanently killed and has survived planet-busting attacks. This looks like a tall order for even this team of Avengers. I say the Heralds take it.