Performance
Regarding horsepower, the Mazda MAZDASPEED3 packs quite a wallop and will knock the Honda Insight down a few rungs. On the other hand, bear in mind that high horsepower engines often command higher insurance premiums.
Handling
With their comparable turning radii, the Mazda MAZDASPEED3 and the Honda Insight most definitely handle about the same into and out of tight spots.
Drivetrain
The Mazda MAZDASPEED3's engine is tremendously larger than the Honda Insight's. Bear in mind that more massive engines may use more gas than smaller ones.
The Mazda MAZDASPEED3 packs quite a wallop compared to the Honda Insight in terms of torque, which is the force that lets you accelerate quickly.
The Honda Insight could learn a lesson or two from the Mazda MAZDASPEED3 when it comes to pickup.
Utility
Neither the MAZDASPEED3 nor the Insight has a marked advantage when it comes to seating capacity.
Convenience
The Mazda MAZDASPEED3's fuel tank will need to be replenished more often than the unit in the Honda Insight.
Comfort
While the front cabin in the Mazda MAZDASPEED3 offers a bit more head room than the Insight, there frankly isn't much of a difference.
The Mazda offers more head- and leg-room to your passengers than the Honda Insight does.
Dimensions
The Mazda MAZDASPEED3 is tremendously more bulky than the Honda Insight.
Your wallet will hurt more every time you fill up the Mazda MAZDASPEED3 than the Honda Insight because of its larger tank.
The Honda Insight and the Mazda MAZDASPEED3 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 almost the same to get the Insight to the dealership as the Mazda MAZDASPEED3.
With respect to fuel economy, the Honda Insight beats the Mazda MAZDASPEED3.
Regarding MSRP, the Mazda MAZDASPEED3 costs almost as much as the Insight (though the Insight is a little cheaper).
The MAZDASPEED3 will cost you a bundle in gas every year compared to the Honda Insight.
The Insight will save you a lots_of_money at the pump every year compared to the Mazda.
Warranty
The Honda Insight and the Mazda MAZDASPEED3 have the same basic warranty.