Another experiment. Using maximum of 36 supplies, each teams of units must destroy 2,000 HP Rock (Both are fully upgraded).
Destroyer (12 x 3) = 1,500/900, 80 second time (considering 8 are already charged)
Void Ray (9 x 4) = 1,800/900 450 second time (considering built in one Stargate) = 71.4 seconds considering 30 chrono mastery + 3 Stargate
Conclusion: Barely same (Full charge Void Ray is very slightly more powerful).
![](https://i.ytimg.com/vi/zgCbC0jkBFk/maxresdefault.jpg)