Mortgages & move to SFBay

I am moving to a new job in the SF Bay Area around Santa Clara, as part of the relocation a few banks contacted me branding themselves as relocation mortgage specialists- is it that much of a discount or special rates that they can offer? I was thinking of renting for a while but didn’t want to lose out on the discounted rates if that’s a real thing, maybe for a starter home . The banks were Chase, Quicken and Premia home loans Has anybody used these services ?