Ask HN: Any of these startup mortgage companies better than traditional lenders?

I'm purchasing my first home and like everything I usually look to the bay area and see if they have solved any of the classic traditional problems. I have family members that swear by "their guy" that works at a mortgage company. The nationwide home builder I'm buying from that says to use them as the lender and covers the appraisal costs etc. But I look to HN to see what's the right choice.

I'm drowning in reviews on Nerdwallet and trying to figure out what is the best option. Better Mortgage seemed decent but had poor reviews and horror stories and not sure if it's offered in my state. It seems a new one of these pop up each week - but I've enjoyed a lot of the financing options like Betterment so it can be done.

Obviously the most important factor is getting the lowest rates and closing costs. I do appreciate a nice UI for making my payments each month though and seeing pretty graphs. But this is for a $300,000 purchase so I don't really feel like increasing my interest rate by 1% because I'm a UI snob.

This is also new construction so I can't have delays working with the mortgage company as when they start building if things aren't all handled properly I'm being charged daily.