Frodo Baggins took upon himself the onus of taking the Ring to the fires of Mount Doom.On his tedious, extensive, peril-covered trajectory, he fights his oppositions—the powers that are trying to thwart his journey, the evil plans of Sauron and Saruman, the mischievous schemes of Gollum with grit, fortitude, courage and resilience. Of course he is helped by Sam, Merry, Pippins, Gandalf, Aragorn and many others. But Frodo's battle was against external perils as well as the dangers that lurked within the deep recesses of his mind: the danger of temptation, the danger of falling a trap to the desire for unlimited power. He had to fight the internal battle alone. And as readers of the book we are not given any clue whether he would be able to reach his destination. There's no prediction regarding the success of his journey. There's no presence of destiny. Frodo is depicted as a man— simple, physically not strong, but has a mind that's capable of taking firm steps towards an almost impossible task. Thus, Frodo becomes a quintessential man who can choose and create his future. Frodo inspires us.
On the other hand Harry Potter is a lucky guy.
We find Harry to be special from the very beginning, not because he did anything important, but he was lucky—he was the "boy with a scar". And then as he grew up, he doesn't seem particularly a bright student—Hermoine is better than him. But he is famous and protected, because he had withstood the attack of Voldemort not by his own skill and how could he? He was a baby then. It was the spell cast on him by his mother that protected him. Harry's only quality is his fearlessness and his desire to do good. In the Order of the Phoenix, we suddenly stop with a jerk at the The Hall of Prophecy. And we realize that Harry's birth was a scheme of fate. Harry therefore ceases to be a human being, but becomes a personification of a prophecy. Harry is a painful reminder of the fact that you can't become a Harry Potter, how hard you might try, unless you are lucky enough.