Big banks are evil and out to destroy you.

Fractional Reserve Banking is a system to destroy you.
i.e. Mortgage - a french word meaning, literally "death note".

Small banks and credit unions are usually not big enough to have turned evil. The bank directors are someone you can meet. You can go all the way to the top. So they are better in that regard.

However, i have dealt with evil credit unions who have done underhanded tactics. Your mileage will vary.

BUT! there will be banking collapses as liquidity gets sucked up to the top. (this is by design) So, soon we will see lots of small banks failing.

And don't worry about who has your mortgage. They will sell it soon. They always do.