IS:
Less heat, better damage on structure, lighter, takes less space.
Clan:
Same heat, single shot, better damage on structure, better (10%)DPS compared to C-AC10 (C-AC10 has in fact longer cooldown due to an added 0.22s delay for three shot burst).
The one advantage that AC10 could have is better accuracy. In fact this advantage is negligeble because the biggest source of inaccuracy isnt weapon dispersion but the fact that you need to predict lead and an uncertainity in enemy movement. Both LB and AC10 have pretty much the same or at least very comparable real damage spread at 300-400m and against a maneuvering opponent.
Edited by lazorbeamz, 19 April 2018 - 05:27 AM.