Groundspeed: Its nice to know how fast you’re moving across the ground when you’re outside of a cockpit/HUD view.
Altitude AGL: Assists in making better judgement for your landings. This is the altitude above ground level.
Winds: Similar to the groundspeed, its nice to know what the winds are like when you’re getting those awesome screenshots and enjoying the scenery of global.
Fuel Remaining: Uhhh, its a must have in the toolbar with global. Without this you’re a doomed pilot, and asking for trouble.
Fuel Flow: This is a great one as it’ll give you an idea of how much fuel you are burning. I keep the Fuel Flow and Fuel Remaining next to each other and in the center as they’re the more important items I keep my eye on when flying.
Visibility: Having more information the better. When approaching an airport its good to know if you’ll have to rely on your instruments to get you to the runway.
ETE to Next or ETE to Dest: I primarily keep this one on ETE to Dest as it’ll give me an idea if I’ll have enough fuel to make it to my destination. The nice thing about this feature is that the ETE to Dest will change to either red or orange depending on how much fuel you’ll have nearing your destination.