I have a 2015 Lariat F150 6speed 2.7tt 3.73gearing. 60k miles. Zero issues. Extended range fuel tank. Empty as my DD I average 20.5mpg mostly highway driving, 40 miles commute each way. I average 65mph on those drives. 740miles cruising range with a full tank. Get the 36gal tank. Get the offroad package and get the 4A feature and the e-locker. "4 wheel drive automatic". I have a supercab, and my truck is way light in the back. I use the 4A feature a lot driving wet roads on hills, and it's been great for winter driving. Going from a stop on a wet hill can cause me to burn out. 4A adds more complexity, but the convenience of being able to turn it on if I'm going into the hilly part of the city when it's raining, or just putting it on when I've got snow on the ground is so nice. Last winter I used it extensively during my commute. You can leave it on at highway speeds. I like the tech stuff. Heated/cooled seats. The truck is awesome on long road trips. Go test drive a few. I would recommend getting the tow mirrors combined with the blind spot sensing. I also wish I had gotten the 360-degree camera system just for the convenience.
I got my truck before getting married and knowing that we are looking at having kids I am also considering trading it in for a crew cab. Right now I am stuck between just getting a crew cab version of the truck I have with Lessons Learned. Tow mirrors/360 camera. Personally I'm considering going with a super duty because I am interested in a crew cab with a six and a half foot bed which would be the exact same size as the F-350 that I'm eyeballing. I don't mind being a guinea pig so I may pull the trigger on the 7.3. Another option would be the Bronco because realistically I can just use a utility trailer for hauling.
The 2.7tt has been outstanding. It does have a little lag, but it's a damn rocket-ship. I fancy the idea of getting the 3.5tt for my next truck. I wouldn't hesitate on the 2.7tt if you don't mind the "turbo" part of it. If it's a matter of price and timing and everything else lines up, don't let the 2.7tt be a deal breaker. Test drive it. The 5.0 is also solid.
The only two things that I have encountered that I truly find obnoxious is the fact I cannot get a nice ARB front bumper or easily find a snorkel. I'm considering getting a buckstop bumper that can accept a winch. I currently have a big Ole police style "grill gaurd". Thing is heavy duty and has already saved my truck from various foes.