Job interview/ just got a job? please help?

i went to the mall today and handed in a job application to aerie and i set up an interview with the manager for tuesday. but then i handed in another application to p.s. from aeropostale (its like a kids store for aeropostale) and the women hired me within an hour and set me up to train on monday for 2 hours..what do i do? i did not expect to be hired by ps aeropostale..and i really wanted to work at aerie. the thing is i really hate aeropostale i never liked it and i really dont want to have to buy aero clothes to wear even to work. and i really would love working at aerie instead should i still go in for the interveiw? and if i got the job there..what would i tell p.s. aeropostale? the p.s. store just seemed really corny and obnoxious to me idk what to do yea i should be grateful i got a job but i would so much rather work at aerie i love that store and its so much more relaxed..what do i do?