Handling
With their comparable turning circles, the Volvo C30 and the BMW 328 most definitely handle about the same into and out of tight spots.
Drivetrain
The BMW 328's engine is substantially bigger than the Volvo C30's. Bear in mind that more massive engines may use more gas than smaller ones.
Torque is roughly equivalent to acceleration, and in this respect, the Volvo C30 is considerably more powerful than the BMW.
Utility
Neither the BMW 328 nor the Volvo C30 has a marked advantage regarding seating capacity.
There's no clear winner between the BMW 328 and the C30 when it comes to hauling capacity.
Convenience
The BMW 328's fuel tank will need to be replenished a bit more often than the unit in the Volvo C30.
Comfort
While the front cabin in the Volvo offers a bit more head room than the BMW 328, there really isn't much of a difference.
While the rear of the Volvo C30 provides a bit more head- and leg-room than the BMW 328, there honestly isn't much of a difference.
Dimensions
The C30's tank is almost the same size as the 328's, though the 328's is a tad larger.
The Volvo C30 and the BMW 328 compete for the same parking spaces.
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 BMW to the dealership as the Volvo C30.
The Volvo C30 will save you money at the pump compared to the BMW 328.
The BMW 328 won't tax your gas budget substantially more than the C30 will.
Regarding MSRP, the BMW costs considerably more than the C30.
Warranty
The Volvo C30 and the BMW 328 have the same basic warranty.