I think Elias was pretty spot on. There will be pros and cons to different lenders, and so it will depend largely on who you feel will be able to help you the most and actually make sure you get to closing.
Could you walk me through why you are putting $25k down? 5.8% down doesn't seem like an ideal down payment amount.
What type of mortgages are you looking at? FHA or Conventional? Conventional rates may be higher, but depending on your situation you might be better off with conventional due to variations in mortgage insurance. Hard to say from the short post here which is optimal.
Regarding the options, there really is a lot that goes into the terms so just some feedback based on what you've said so far. 1. When it comes to a broker, they probably won't be able to "match" anything. They are subject to the rates from the lenders they work with. This pricing might seem a tad high, and would be curious how many lenders/programs she actually works with. 2. How much higher would the closing costs be? This pricing seems almost too good to be true. I would just do your due diligence as unfortunately "bait and switch" as Elias mentioned is a real thing. 3. Credit Unions have some flexibility with their pricing especially if they won't be selling it on the secondary market. However, they generally have lender overlays with stricter guidelines and less programs. Weighing the option of fixed vs. arm right now, I would determine how long you plan to have this as your primary residence. You can refinance it with less than 20% equity BUT only as long as it is still your primary residence. So if you move out, then you would need to have that equity built up to refinance. 4. As a lender, chase being a large bank has pricing flexibility as you noted with their rate but they are a bank first and mortgage company third or fourth. Most of those claims to pay if not closed on time have loopholes/tight requirements and more often than not we have seen the fall-out.
This is a lot I know haha but hope this gives some context.
