I still don't get why people are investing on Jupiter and don't finish Saturn . You get the same GH don't you ?
Delivery times.
11 Saturns have been ordered and one Jupiter. If I invest in the Saturn then no matter what happens I will not start mining until all 11 have been delivered. On the other hand, by investing in the Jupiter I will start mining the moment the first Jupiter is delivered. This might not be until all 11 (or even more) Saturns have been delivered but there is a chance that it will be sooner than the 11th Saturn. This will all depend upon KnC's manufacturing priorities.
As with any gamble, there is also the chance that it wont be delivered until after the 20th Saturn has arrived but that is why it is a gamble.