For me, it is all about trust. If you don't trust that your investment manager will make sound investments on your behalf and do so ethically, then why would you want to work with them? A good advisor will always have your best interests in mind and be willing to share their point of view with you, even if it's not what they've always been taught or expected.
This applies to everything from your day-to-day finances to long-term planning for retirement—you need someone who will listen to what you want and help make it happen, no matter how unconventional their approach might be.