Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. It costs approximately the same to get the 750 to the dealership as the Lexus.
The BMW 750 guzzles a lot of gas compared to the Lexus.
As far as MSRP, the GS 450h costs tremendously less than the BMW 750.
The Lexus GS 450h will save you a bundle at the pump every year compared to the BMW 750.
Utility
The BMW and the Lexus GS 450h can accommodate the same number of passengers.
Convenience
The BMW 750's fuel tank will need to be replenished a bit more often than the unit in the Lexus GS 450h.
Comfort
Taller drivers will significantly enjoy the extra head room in the BMW 750's front cabin compared to the Lexus GS 450h.
The BMW offers more head- and leg-room to your passengers than the Lexus GS 450h does.
Dimensions
Your wallet will hurt more every time you fill up the BMW 750 than the Lexus GS 450h because of its bigger tank.
The Lexus GS 450h and the BMW 750 compete for the same parking spaces.
The BMW's longer wheelbase will likely result in a smoother, more stable ride; on the other hand, the Lexus GS 450h may give a sprier feel in daily traffic.
Performance
With respect to horsepower, the BMW packs quite a punch and will knock the Lexus GS 450h down a few rungs. However, keep in mind that high horsepower engines often command higher insurance premiums.
Handling
With its tighter turning radius, the Lexus is most certainly more maneuverable than the BMW, something to consider if you do a lot of city driving; on the flip side, note that a vehicle with a tight turning circle may feel a bit twitchy on the highway.
Drivetrain
The Lexus GS 450h's engine is considerably smaller than the BMW 750's. Keep in mind that smaller engines can be stressed more; on the other hand, smaller engines typically get better gas mileage.
Torque is roughly equivalent to acceleration, and in this respect, the BMW 750 is tremendously more powerful than the Lexus GS 450h.
Warranty
The Lexus and the 750 have the same basic warranty.