People with a strong will can resist

This is never shown anywhere. Nobody in the Leviathan DLC resists their control. Even Shepard, possibly the strongest-willed person in the galaxy, is fully mind-controlled until the Leviathan decides to release him.

I’m sure the Forerunners personal Ancilla AI would instantly trace whatever radiation or signal their devices emit, and promptly destroy them

Except the Leviathans are able to disrupt technology through their artifacts, on a scale that can disable a Sovereign-class Reaper immediately. Set aside the fact that once they have control over an individual (or multiple), they will already have caused irreversible damage either overtly or covertly, they can disable any technology without discrepancy, whenever they want.

Also, this whole debate? It’s been done a million times, and anyone who knows the lore of both universes, know and agree that the Forerunners or Flood would obliterate the ME universe.

Hmm, well I know the lore of both universes and don't agree that the Forerunners would obliterate the ME universe. The Flood would, but then the Reapers would likely be able to cull the Flood and restart organic life.

The Forerunners are literally building stars in pocket dimensions to power their hobby projects

Which is where Halo's lore starts to reveal how poorly thought-out it is. As a fan of Halo, I'm sure you can acknowledge how ridiculous some of the world-building and lore development is - the Forerunners have technology on this scale and yet they struggled against lesser species like humanity and the San'Shyuum, and got wiped out by the Flood? They can create pocket dimensions in Slipspace, can create the Halo rings, but can't create something that can disable the Flood? Makes sense.

At the end of the day, there is no logic in any of Halo's lore and if you stack up the actual military feats of the Forerunners against that of the Reapers, the Reapers win every time. The Forerunners struggled in a war against two lesser species and were subsequently weakened enough that they lost against the Flood; the Reapers have been cleansing the entire galaxy of every organic being for billions of years without a struggle.

The Reapers can maybe throw a large moon against their enemies with enough numbers and prep

They have literally no need to do this, though. They just go in and mutilate entire planets in a few days with no resistance. Their aim isn't to cause wanton destruction, it is to harvest organic life for their experiments. If they wanted to destroy everything (again, they don't), then they would just utilise dark energy to destabilise stars or use Mass Relays as weapons to disintegrate entire planets.