When choose the Anti Grav???

[Vomitus]

Actually you can buy the molotov cocktail that can compete with a heli in medium range combat. It has 950 range. Glaive thrower have shorter range.

Yes, I can, but it is less effective than Glaive. Molotov coctail does not fit in a tactic I described with two reasons: 1) Lesser damage/cost ratio; 2) too long distance makes weapon less effective in close combat because far standing creeps also act like a shield against my weapon. The longer range of the weapon the more effective creep-shield is!