In the interest of investigation
Here’s 2 test data done on M’s Void Launch
Test 1 - Drill Mastery Focused (30/0, 0/30, 0/30)
- 7min Full Saturation
- 890mineral, 1510gas banked
- Investment (100/100 + 150/150 drill abilities, 720mineral vespene drones)
- Total income 1860min/1760gas
- 1 x Concentrated Beam used (Bonus 2 wiped) + 30sec out on 2nd Beam
- 1 x Pulse Cannon used (Bonus 3 wiped)
- Tech level Factory + Armory
Test 2 - Vespene Drone Mastery (0/30, 0/30, 30/0)
- 7min Full Saturation
- 1410mineral, 792gas banked
- Investment (5 Tanks Made, 150/125 x 5 = 750/625)
- Total income 2160min/1417gas
- No enemy base touched
- Tech level Factory + Armory
There you have it the comparison is fairly clear. Neither one has a clear advantage at all over the other.
2160min - 1860min = 300min, make sense since non-drill opens with a faster CC, thus a bit extra mineral income.
1417gas - 1760gas = -343gas, despite cheaper VD, this is a surprising find. Even if we account for the 325gas (see OP), this is basically equal gas income (off setting 350min... point is both income are equal)
Wave 1 & 2 dealt equally effective. ARES for wave 1. Abundance resource by wave 2, using any units made, drill, make static, etc.
Tech level exactly the same. Both of which could have pushed higher into Starport, as well as 2nd Armor with no problem. Given the similar income, research timing would be similar.
Biggest difference here is Drill Mastery actually wiped out 2 enemy strongholds, aka cleared Bonus 2 + 3 areas before 7min. Considering an active player can float Factory to Bonus 1, it is clear the progression is far faster.
Now, if anyone feel inclined to disagree with the data. I would love to see something different. After all, I don’t claim to be a mastery Swann player.