The waiting period of the car depends upon certain factors like in which state you living in along with colour and trim. However, the standard waiting time for BMW 5 Series is around a week or two. You can click on the following link to see the details of the nearest dealership and selecting your city accordingly - Car Showrooms.
You can get better engine displacement(2993cc) and power(265hp@4000rpm) in BMW X5 compared to BMW GLE(engine displacement(1950cc) and power(241.3bhp@4200rpm)). However, BMW GLE, can offer you more features then BMW X5, in comparison like, Automatic Headlamps, Blind Spot Monitor, Hill Assist, 360 View Camera...etc. However, we would recommend you to take test drive and choose the best car for yourself. For more detailed comparison between both the cars, lease click here