What cities do you mostly travel to when you say global? You seem to indicate there are some frequent ones? If Hyatt is in those specific areas it may be your best bet for the reasons people mention, especially early check in and late check out. You'd easily earn Globalist every year. But if Hyatt isn't in cities you need, it wouldn't be as great. You also could double up. If you use a credit card for one, say Hilton Amex Surpass which gets you Gold for example, you could carry both Hyatt and Hilton and that could cover you.