Superman and Shazam win this.
Superman has already beaten Major Force, by melting his Dilustel skin with his heat vision. Such a tactic wouldn't work on Captain Atom due to his energy absorption ability (an ability that Major Force doesn't have), but he could still be forced to Quantum Jump, nonetheless. Atom has been staggered by Superman's heat vision before, however.
While both Atom and Force are more than strong enough to physically engage the other team (via power-scaling), the combination of their abilities may prove to be too much for them after a while. Both Shazam and Superman's superhuman physical capabilities (specifically superhuman strength, durability and speed) have more quantifiable showings to support them in combat. Atom, however, is arguably more durable than Force (the latter has failed to withstand numerous damage types that the former has shown to withstand, on-panel) and would likely last longer than Force would.
There's also the fact that Atom and Force don't exactly work well together, which is a problem that Superman and Shazam don't have. I'm just going based off of how both teams are shown to work together.
It would be a good fight, though.
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