First time home buyer, should i use my bank first to get pre approved or broker

[Jimmy Rojas]

I live in Phx,Az , where should i apply for a mortgage loan first at my local bank (wells fargo) or use a broker, a lot of people here tell me to start with my bank as they have all my info, if i get pre approved anywhere i wouldnt be committed/obligated to go along with the deal right ?