considerin a4 or a6

hey guys .. im turnin 16 in bout .. like a week or so .. and like .. id like to kno whether or not to get an a6 or an a4 .. if i get the a4 .. im likeli to get the turbo one 1.8t i think .. and if i get the a6 .. id juss go with the 1998 sedan one .. which one should i get .. i juss want a nice smooth lookin car that has some nice acceleration wen i stomp on the gas pedal.