Various hotel promos have people going different directions this fall; but I am wondering what people are building point totals in?

Despite Marriott/SPG's promotion right now, I have been staying at Hyatt hotels (Securing Diamond status) - and just building points as it is the program I have the least in.

After this - I will do 2 weeks in SPG hotels, then probably switch back and forth between Marriott/Hyatt for the remainder of 2016.

I am just debating if I shouldn't be considering SPG for a 3rd week - instead of staying an additional 5 nights at Hyatt (will have at least 57 nights in Hyatt vs. 80 in SPG). I don't see any way to making it to Plat 100 - although the 2X points + 500 points is really a lucrative deal it seems?!