Tracy,
It sort of depends on your relationship with your bank. I have a good relationship with my bank going back 20 years, and I knew the offer they made me would be hard to beat, so I didn’t shop around. However, if you aren’t sure, then it makes sense to search the market for the best deal, and a good mortgage broker is a real help in doing that.
You can find both bank and mortgage broker in my services directory here:
https://www.spanishpropertyinsight.com/services/