The Sierra HD AT4/Denali offers an optional heads-up display that projects speed, warning, navigation instruction, infotainment and driver assistance information readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The Titan XD doesn’t offer a heads-up display.
The Sierra HD’s power parking brake sets with one touch and releases with one touch or automatically. The Titan XD’s parking brake has to be released manually.
The power windows standard on both the Sierra HD and the Titan XD have locks to prevent small children from operating them. When the lock on the Sierra HD is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The Titan XD prevents the driver from operating the other windows just as it does the other passengers.
The Sierra HD’s standard front and rear power windows all lower with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside of the car. The Titan XD’s rear power window switches have to be held the entire time to open them fully.
The Sierra HD has standard Push Button Start that allows you to start the engine without removing the key from the pocket or purse. The Intelligent Key costs extra on the Titan XD.
To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the GMC Sierra HD (except Pro) offers an optional wireless phone charging system (Qi) in the front center console. The Titan XD doesn’t offer wireless personal charging.