Global Entry and TSA PreCheck are the two main options you have to choose from if you want to get precertified for expedited treatment at U.S. Government checkpoints. Both of the services give access to the TSA PreCheck lanes at U.S. airports. This means you don’t have to go through the whole security theater of taking off your shoes and belt and removing your iPad and liquids from your bag. Most of the time you’ll also avoid going through TSA’s nude-o-scope and only need to pass through an old fashioned metal detector.
Global Entry, while a more lengthy process, also gives you expedited passage through U.S. Customs and Border Protection lanes when re-entering the United States. Just go to a Global Entry kiosk and enter your travel info, answer the usual questions and get your picture taken. Go to meet an agent and you’re on your way.
If you had asked me up until now, I would have told you to go for Global Entry. In fact, I did say exactly that in my article comparing the services: