Unit size

[Ghaust the Moor]

which unit size would be best for an accurate legion recreation

[Celtic_Punk]

large to huge.

with huge you can force immigrate sections of population (recruit akonistai, or another cheaap unit with lots of guys.)

field battles are longer and harder to control (realistic) and siege battles are absolutely epic!!!!! trillions of soldiers storming through, and your hoplites presenting themselves in narrow streets. awesome! at the end the bodies pile up and you cant tell the difference between road or grass.

[The General]

which unit size would be best for an accurate legion recreation

Huge gets closest, as a legion usually had from 4,500 (early-to-mid Republican) to up to 5,200 men (from Marian's times through early Imperial period to mdi-Imperial times) - not including auxiliaries.