I have had the pleasure to drive both of these cars (
2010 Corolla S vs. 2009 Mazda3). Here is my review:
MPG:
Corolla wins - I was getting around 37mpg on the highway with the Toyota. The Mazda3 was getting around 31mpg.
Handling:
Mazda3 wins - The 4-wheel independent suspension handles well and takes the corners a lot better than the Corolla.
Ride Quality:
Corolla wins - The Corolla ride is more supple and the Mazda3 is a little bit harsher (stiff). For long trips, the Corolla is more comfortable.
Acceleration:
Mazda3 wins - The engine is more peppy and it feels more zippier than the Corolla S. The 5-speed auto trans in the Mazda3 adds to this.
Braking:
Mazda3 wins - The car has large 4 wheel disc brakes. It stops very well. The Corolla's rear drum brakes continue to be a negative on the cars stopping power.
Exterior Styling:
Corolla wins - The lines and look of the Corolla are very nice. The 10th generation Corolla has a "Camry" look to it. The Mazda3 is OK, but not as nice as the Corolla.
Interior Styling:
Corolla wins - This was a hard one, so I broke it down to sub-groups, but the Corolla is nicely appointed. I believe the Mazda3 has better fit and finish with the interior components.
Stereo/Speakers:
Mazda3 wins - The Corolla S has the upgraded JBL package, but even then, the Mazda 3 stereo setup is louder, clearer and better sounding.
Trunk Space:
Corolla wins - The trunk is much larger than the Mazda3.
Interior Room:
Corolla wins - It has more rear seat leg room and the car sits a little wider than the Mazda3.
Fun Factor:
Mazda 3 wins - Hands down, the Mazda3 is A LOT more fun to drive. I can see why Motor Trend, Car and Driver, Edmunds and every other car mag has reported the same. The Mazda3 is a really fun car to drive.
Luxury Factor:
Corolla wins - The Corolla is more of what I term a "cruiser". It is relaxing and comfortable to drive in for long trips. The road noise is lower than the Mazda3. The Corolla seems to seal out the wind and noise better than the Mazda3. The suspension on the Corolla is more forgiving.
Seating:
Mazda 3 wins - The seats seem to work better and hold you in comfortably. I feel like I can't get the seat right in the Corolla. Might change with time.
Fit & Finish - Reliability:
Both cars are head to head. Time will tell. The Mazda3 is built in Hiroshima, Japan and shipped over. The Toyota is built here in the USA. The Mazda3 contains 95% Japanese parts, while the Corolla S contains 60% Japanese parts, the remaining 40% is American and Canadian parts.
Consumer reports show both cars to be pretty close. Depending on the study, the Mazda3 sometimes does better. I think both cars will do well in the long term.
I hope this review was informative. I love both cars, but they are different, as they have different "personalities".