One note about all research - the missions launched from the Laboratory reward a huge amount of both protoss and zerg research. As far as the final tier, I would go tech reactors all the way as it gives the most flexibility yeah you can always build more unit-producing structures, but gas can come at a premium in some missions, and there is no real advantage of the drop pods outside of possibly for a Normal speedrun. The science vessel is amazing in a few missions, I would pick it over the raven without a second thought. Automated refineries are the alternative they are a strong choice as well if you want to spend less time on macro they are also more efficient by about 100 minerals / gas, see 4th page for math. Reactored SCVs are amazing for cranking out an economy for timed missions / achievements and replacing your repairers. In general, stay away from gimmicks such as instant supply depots, and pick the upgrades that best suit your playstyle (although I highly recommend attack speed over more health). It will be as spoiler-free as possible.Ĭredentials: Kerrigan icon and the majority of Hard achievements earned on Brutal, including Aces High after about 80 loads and 4 restarts of the final mission. #1 Making this thread for others to learn from my mistakes.