Given its torrid growth in 2020 and 2021, it's hard to believe that United Parcel Service (UPS -0.75%) stock is down over the past three years. But fundamentals have been declining. And there are questions about whether the company's margin expansion is sustainable or if it was just a result of a pandemic-induced boost. UPS is in for a challenging 2024. Even so, it stands out as my top high-yield dividend stock to buy next year. Here's why. Investing in long-term growth The greatest challenge in valuing a s ...