I just realized I forgot to follow up with this. And I forgot about the free night, which probably does tip the scale in favor of the additional $15K. (Although is it an additional $15K or an additional $12K? Here is what the Chase website says: "30,000 Bonus Points after you spend $3,000 on purchases in your first 3 months from account opening. Plus, up to 30,000 More Bonus Points by earning 2 Bonus Points total per $1 spent in the first 6 months from account opening on purchases that normally earn 1 Bonus Point, on up to $15,000 spent." So does the first $3K not earn the additional 2 points? At least it's clear that I have 6 months.)
I don't think Globalist is a realistic goal since the only Hyatt stays I have upcoming are on points.