So never used them before but would like to when I fly into DFW next month. It will be about at 1 hour drive to my destination. Can I book them in advanced or is it best to book once I land?
Download both apps now. They usually give promotional credits for first time users. Usually around $10 off first few rides. Whichever gives the better deal, go for it. They're pretty even as far as service in my experience, so i take whichever one offers the the best deal.
And no, you don't order in advance. When you have your bags and are ready for a pickup, you pull up the app and request a car. FYI, you can see on the app how near the closest car is (in mins). HTH.