If you live near a major airport where they have adequate staff and do the Global Entry interviews, then it is simple to go with GE over TSA PreCheck. For us, it was a PITA. There were three of us, and Denver was the only airport within 500 miles for the interview (still an hour one-way drive, plus expensive parking). They were booking 10+ months out, and since you could only book an appointment from within your account, and there were so few openings, we could not get all three of our appointments on the same day. We got two on one day, but the best we could do was two hours apart. There is absolutely no way to talk to someone if you have questions or need help with scheduling -- they had a phone number that was disconnected, and an email link. Tried that, and after 3 weeks, just got back a canned message which was not helpful at all.
In Denver, they had two agents, each booking appointments at 15 min intervals. Even though my interview took all of 5 minutes tops, they only processed 4 interviews in an hour. Absolutely no walk-ins, and when you arrived for your appointment, you just had to wait outside a metal door off of a main hallway, no windows, no chairs, no receptionist -- an agent would come out at the 15 min mark and call the next person in. If that person was not there, they didn't take the next in line, they just did nothing until the next 15 minute mark. What a bunch of lazy, government "workers".
We did make it through the process, but it took over a year from the time I applied to when my GE account was approved. If I have to go through the re-interview process to renew my account, there is no way I will do that again. I'll just go to TSA PreCheck and be done with it. I can't believe my tax dollars are paying for this grossly inefficient process. A monkey could do a better job.
Kurt