Should I get a loan from a credit union or a private lender first

[Reynald Jean]

I got the pre-approval letter for my credit union last week, for 200k which is more than what I need to buy the house my realtor suggest that go with a private lender instead of a credit union. He said that the private lender will give me a better rate than a credit union. Any advice what are the cons and pros from both

Thank you for your help.