should i get a 2006-2008 mazda 3 or a 2006-2008 mazda 6?

i reallly love those cars!
one of those will be my first car
i want something not so big and not so small
has to have good room in the backseat
i dont want it to be really fast but not a grandma's car either.
i want it to be really smooth!
so which one would be best for a 16 year old?
pros and cons?
thanks
i really need help on the decision :)
 
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