Handling
With their similar turning radii, the BMW and the Volvo S80 most definitely handle approximately the same into and out of tight spots.
Drivetrain
The BMW 3 Series's engine is significantly bigger than the Volvo S80's. Note that larger engines may use more gas than smaller ones.
The 3 Series has no lessons to learn when it comes to pickup from the Volvo.
Utility
The Volvo S80 is a better choice than the BMW 3 Series as far as transporting cargo, especially if you frequently need to carry a lot of suitcases or pets.
The BMW and the S80 can accommodate the same number of passengers.
The Volvo S80 outpulls the BMW 3 Series by a massive margin.
Convenience
You'll indubitably take the BMW 3 Series for a fill-up approximately as often as the Volvo S80.
Comfort
While the front cabin in the S80 offers a bit more head room than the BMW, there really isn't much of a difference.
While the rear of the Volvo S80 provides a bit more head- and leg-room than the BMW 3 Series, there honestly isn't much of a difference.
Dimensions
The Volvo S80 is a little more ponderous than the 3 Series.
The BMW 3 Series's tank is about the same size as the Volvo S80's, though the Volvo S80's is a bit more capacious.
The BMW 3 Series and the S80 compete for the same parking spaces.
Cost
There honestly isn't much of a difference in gas mileage here, but if you must know, the BMW 3 Series is somewhat more economical than the Volvo S80.
As far as MSRP, the Volvo costs about as much as the 3 Series (though the 3 Series is a tad cheaper).
As far as out-the-door price, the BMW 3 Series costs roughly as much as the Volvo S80 (though the Volvo S80 is a little cheaper).
Overview
The Volvo S80 and the BMW 3 Series have the same basic warranty.