Six one way, half a dozen the other. Ford Vs. Chevy argument. You're better off figuring out how many rounds you want/need to reload within a week's time, how much time you have to reload, what you're going to reload (pistol or rifle) and make your decisions from there.
Both presses are fast. Both presses are good, solid, dependable loading platforms. The Hornady is a little cheaper, the Dillon has a little better customer service.
I have a Hornady, I love it. Most Hornady owners do. I have a friend who has a Dillon. He loves it. Most Dillon owners do. Some own both, some have changed from one press to the other, depending on their needs. I did this, upgrading from a 550 to a LnL.
Bottom line is, an advice to search and see the pluses and minuses of both is not a bad idea. However, if it was me, I'd look at all the features of both presses, the budget I had and make a decision from there.