(See) Die deutsche Marine

[Broensen]

Fähigkeiten machen eine Fregatte zur Fregatte und einen Zerstörer zum Zerstörer - und F125 ist realistisch betrachtet keines von beiden.

Richtig, definitionsgemäß ist sie ein Kreuzer:

CC / CRUISER, GENERAL = GENERAL DESIGNATOR FOR ALL CRUISER TYPE SHIPS OF 140 METRES OR MORE

DD / DESTROYER, GENERAL = GENERAL DESIGNATOR FOR DESTROYER TYPE SHIPS. MAJOR SURFACE COMBATANT IN RANGE OF ABOUT 95 TO 140 METRES WHOLE GENERAL MISSION IS TO CONDUCT OPERATIONS WITH STRIKE, ASW AND AMPHIBIOUS FORCES, AND TO PERFORM SCREENING AND CONVOY DUTIES. MAY HAVE HELICOPTERS NOT ESPECIALLY FITTED FOR ASW

FF / FRIGATE, GENERAL = GENERAL DESIGNATOR FOR FRIGATE. A SURFACE COMBATANT IN SIZE RANGE OF ABOUT 75-150 METRES. FITTED PRIMARILY TO FULFIL AN ASW ROLE. GENERALLY HAS LIGHTER SURFACE ARMAMENT THAN DD

...
F125:
Am ehesten trifft das wohl der Kanonenkreuzer.
(CA CRUISER, GUN CRUISER WITH GUNS 15 CM (6 INCH) OR LARGER AS ITS MAIN ARMAMENT AND WITH NO MISSILE SYSTEMS)