Shop lenders or stick with one and build a relationship?

[Grant Berthold]

I'm looking to purchase a property and I've trying to figure out what's the best course of action in regards to lending. I've heard advice from both sides - Some people I've talked to say that you should always shop around to get the best rates. Every lender is different and therefore by looking around you can find best product for your situation. Others I've talked to say that instead of shopping around it's best to stay with one lender and build a relationship. Over time the relationship and trust will grow, borrowing will become easier and eventually they'll be asking you if they can lend you more money!

I don't know who's right and I'm hoping to glean some wisdom from the biggerpockets community on this one. Thank you!