As a carrier? The Heron. Between the speed and system, it is about twice as good at being a dedicated carrier.
The Mora isn't a bad ship though, if built as an interceptor spewing brawler: its very hard to kill, has a good number of the excellent small ballistic mounts, and has the burst firepower in its missiles to heavily punish ships that overload nearby.
[Edit] I wouldn't say the Heron can destroy ships up to cruiser size in 1 run... its theoretically possible, but only if the ship is already overloaded by something else. Its not going to get through the shields of a cruiser or destroyer in a single attack run.