Awfully hard to say. Probably my Ballard with Stevens-Pope barrel for shear pizazz, or my 1950-vintage BSA International for shear utter accuracy. The as-issued M2 is another one whose whimpering would give me pause if I passed on it.
None of the current crop of .22's so much as turn my eye, especially the plastic ones. I really don't care how well they shoot - they lack soul.
100yards, 5 shots: