[Suicide Junkie]

Every ship gets grav cloaking based on their size.
Active and passive cloak require the armor components, while psychic cloak involves not having crew (master computers).
In this case, the cloaking devices overpower sensors at max tech.

In order to get undetectable grav cloak, you need frigate or smaller. When you try to apply the other cloaking devices to a frigate hull, you are left with almost nothing for engines and weapons. Larger ships can be detected by massive, base-mounted grav sensors.

So, tiny ships are the only perfect stealth craft, but can be fended off with mines.
Small to medium ships can't be detected except by a huge base, which makes a great target.
The heavier ships can't fully cloak, but can carry enough firepower and defenses to drive their way through with brute force.