Of these three, if you believe in MPT, the financial advisor is simply a coin-operated sales guy. At a 1% fee against $25 million, your business represents $250K/yearly. That is a solid sum of money to any business.
But practically speaking, what is that financial advisor going to sell you? Odds are after you get past the glossy color printed custom, just-for-you, spiral bound investment plan, you will see a custom portfolio that will be assembled with MPT. This is the product that sell every day to every other $25 millionaire that walks in the door.
Sure, you get to tune the outcome based on your risk threshold, or other biases you may have. But unless you are rolling your own investment strategy based on your own perception of future returns across asset classes (in other words running your own micro-hedge fund) you are buying MPT.
Are there managers and funds that beat everyone else year in and year out. Yes there are. Why don't you get the chance to park your $25 million with them? Because even the choice of parking your funds with them is bound by the math of MPT.