BMW X5 xDrive30d xLine 3.0 Diesel

Firstly, there is no Mercedes GLE 450d variant. There is a diesel 400d, but the variant you must be meaning is the Mercedes GLE 450 4MATIC petrol, which compares with the BMW X5 xDrive40i petrol.  

Both the Mercedes-Benz GLE450  and the BMW X5 are very closely matched in power, using 3.0-litre turbocharged inline-six engines with 48V mild-hybrid systems. The GLE 450 4MATIC produces 375-380hp whilst the BMW X5 xDrive40i produces a near identical 375-380hp. Top of Form

The BMW X5 has slightly higher torque at 520Nm to the GLE 450’s 500Nm, which contributes to a more sporty feel. 

In fact, the BMW X5 is known for a more sporty, engaging driving character, with quicker acceleration. Whilst the Mercedes-Benz GLE 450 delivers power in a very linear, smooth manner, prioritising comfort and luxury. 

Yes, considering your driving is in the city, the Lexus RX 350h is a good option. Its strong hybrid powertrain is incredibly efficient, which will bring down your running costs considerably compared to the BMW. Also, service and maintenance costs will be lower, too. 

It's also very luxuriously appointed and well equipped, with a uniquely Japanese take on exterior and interior design. Do note, however, that it is slightly less spacious than the BMW X5. Especially if you intend to carry three passengers in the rear seat frequently. Though the chassis is able enough, the four-cylinder naturally aspirated petrol-hybrid powertrain is nowhere near as strong or exciting as the 6-cylinder petrol and diesel engines that power the BMW X5.

Without knowing your specific requirements, it is hard to give you a definitive pick. Of the options on your mind, the BMW X5 and Mercedes-Benz GLE make for the most well-rounded luxury SUVs. They are spacious, well-equipped, comfortable and good to drive. 

The Range Rover Velar is big on style but isn't as roomy as the other SUVs. The Volvo XC90's firm ride and lesser refinement mark it down. 

There are plenty of options to choose from - including your Range Rover Sport - which is good to drive and be driven in. However, since you already have one of those in the household, why not consider something different? 

Cars like the Mercedes GLE and BMW X5 are good options, but since her travel is primarily in the city, an interesting and often overlooked option is the Lexus RX. Unlike her Volvo, this is a strong hybrid, not a PHEV, so there's no need to plug it in to keep the battery topped up. 

It's also quite enjoyable to drive, offering a serene rear-seat experience when she is chauffeur-driven. Plus, Lexus's uniquely Japanese take on luxury is unlike any other in the segment and would feel like a meaningful change from the Volvo. As a strong hybrid, running costs will be very low, which is a bonus.