mr politician firstly allow me to welcome you here.
now as far as your inquiry is concerned let me try to balance my views in comparing your two choices by citing the pros and cons of both sedans.
aesthetics: the mazda3 is the winner . inside out the mazda 3 has this kind of design that ages well. in fact the mazda 3 hasn't rcvd any iteration as of late and yet whenever you see one on the road you'll never lax in admiring it's look. mazda also has been one of the 1st if not the very 1st to make use of controls integrated in the steering wheel , and now this part of technological set up is already a trend.
power: this i give to the altis , it has 108horses vs the mazda 3 @ only 104 the torque is equal at 145nm both of them has an archaic 4a/t but the stick shift of the altis has 5gears that you can utilize.
exclusivity; no question about it the mazda 3 feels more exclusive . hence you have more road cred ( altis is one favorite of taxi operators.)
reliability: this i would say is equal. not only will this cars bring you from point a to point b , but both sedans will offer a distinctive feel in your driving experience .
durability: the time tested TOYOTA will snatch this part by a mile. toyota is a household name why? it's proven to really last a long time . the main reason for this is that spare parts are copious( abundant) therefore maintaining your toyota will be a bliss.
maintainability: again the toyota will be relatively cheaper vs the mazda 3 because spare parts will never be an issue.
ease of use (comfort standards): this is where tha mazda3 shines. in long drives you will be more relax inside a mazda3.
resale value; toyota will retain it's value longer after owning it
my final verdict: if the purchase is a brandnew unit i will say go for the MAZDA3 however since the unit you will be buying is PRE OWNED go for the ALTIS, soon you will have to encounter some issues with your car and it's an added insurance to know that parts are available anytime and also the replacements are really cheap. plus factors your folks will admire your decision, lam mo nman ang mga magulang walang bukang bibig yan kundi toyota kasi subok na matibay.
enjoy your GIFT AND love your parents as much as they love you.