Sima Sapian reduces the decay of sentient goods. MH increases your standard goods only. And the time warp increases your sentient goods production. From this we eliminate the MH because it doesn't effect sentient goods production and you are concerned with sentient goods. Looking at the Sima Sapian we find it lowers sentient decay by .2% per level while the timewarp increases production by 4% per level. If you are producing 20k of sentient goods a day and increase that amount 4%, you get....800 more sentient goods. And if you have 100,000 sentient goods and they decay by 5% you lose 5,000. Reduce that by .2% (by raising the Simia Sapiens one level) and you save an additional....10 from decaying. So for each level you raise the Timewarp you add 800 and each time you raise the Simia Sapien you save 10 more so from decaying....provided you produce 20k sentient goods per day and have 100k of sentient goods in stock. All of which shows that it....like so many things in this game....depends. If you are at the levels described -- 20k/day and 100k in storage, the timewarp is where you should focus your attention. But if you have 500,000 of sentient goods in storage you save 1000 per day from decay (500,000 * .2%) which is higher than the 800 per day you increase your sentient goods production by if you raise the timewarp. So, here's how you calculate which AW to increase/add. Start with S (the amount of stored sentient goods you usually have on hand) * D *1.002 (the current level of decay times what it would be if you raised it one level). Then take P (the daily sentient good production * B*1.04 (the Bonus from the timewarp if you increased it's level by one). Whichever number is larger tells you what you will gain by increasing/adding that AW.
Note: if you put the Simia Sapien in it may be that you get a large decay reduction from level 1 (I believe it's 1.2% at level one and then lowers the decay level by two-tenths of a percent each level after that), so the initial build is 6 times more than each level after that. More complexity to compute. You have to consider the space and if, after level 1, the .2% increased reduction in decay is worth the space when you could just raise your timewarp one more level and, maybe, do better?
AJ