Do NOT always go with the cheaper rate. This is a big financial decision and you want the deal to be smooth and you want to know that the deal is going to close accordingly. There are nightmare stories about Rocket Mortgage. Find a lender who is referred to you by people you know or people who invest. Find a couple of options. Then talk to them and find out which one is the most transparent, reliable, communicative, experienced and has a competitive rate. Sellers often deny rocket mortgage offers because they are known to fumble last minute:

https://www.reddit.com/r/realtors/comments/10l5eo8/sellers_distrust_rocket_mortgage/