Based on the test drive, below is my observation
Serena
Feel the car are light even it was 1.6 Ton when driving
Wide windscreen
Flexible seat arrangement especially the last row could put up.
Drawback:
Interior look very cheap funny a bit
Sound system bad
Driving van
Mazda
Stable especially cornering even seat at 3rd row
Flexible seat arrangement to provide more leg room
Biante out from my list as Japan factory scheduled close down Mazda MPV production line
Drawback
Wide windscreen but big blink spot between the main and site windscreen
Last row can't be put off which limit the space
Feel the car are heavy and like under power
3 rows seat quality lousy than 2nd row and smaller size
New Innova:
Good respond & all new safety items like 7 Airbag where the Serena / Mazda didn’t have.
Drawback
3 rows bit small leg room
3 rows seat quality lousy than 2nd row and smaller size.
If want to go 3rd you need to flip 2nd row to go in even small kid. * Take note when want to close the 2 row seats need ensure the leg are not in seat lock area will very painful ( go show room & seat at 3rd row then try close the 2nd row back, you will know). Not good on long distance & people size like me where will get head jackpot.
Non flexible on seat arrangement compared to above 2.
go and test out before buy....
* as on Jan 2017...I'm own Serena now