If you try to win clients by low pricing, you will develop a rolodex of clients that hired you because you have the lowest fees. and those will be the clients from whom you source of all your return work. You can get pretty busy, pretty fast taking this approach.
If you try to win clients with outstanding service and value, you will develop a rolodex of clients that hire you because of the value you bring. regardless of whether or not you're the cheapest. It will take much longer for you to get busy taking this approach.
A "blended" approach? Well, never really seen that. Usually firms that compete based on price get very busy very fast, and are constantly operating at full capacity, rushing to get things out regardless of quality, late on deadlines, putting out fires left and right.
It's hard to identify a client that will pay for good service, until you price them. If you price them low, give them poor service, the clients that are willing to pay well for good service won't come back again, they will just go elsewhere.