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Dell Alienware AWH monitors 2020 vs LG UD5 series (2016)
Dell Alienware AW2521HF 25"

The Dell Alienware AW2521HF 25" and LG 27UD58 27" make for good, if unremarkable, Monitors at their respective budgets.
With that said, while they both should serve reasonably well, you might want to look into other options at the $450 and $310 price points - it's likely that there are some better alternatives available.
If you want to learn more about the Dell Alienware AW2521HF 25" and the LG 27UD58 27", however, we prepared a summary of the information that we have:
The Dell Alienware AW2521HF 25" was loved by reviewers at Rtings, a highly trusted source that performs reliable in-depth testing. It did great in its "The 5 Best Gaming Monitors For Xbox One X - Winter 2021" roundup where it was named its "Best 24-25 Inch Gaming Monitor For Xbox One", which, in itself, makes it a product worth considering.
Returning to the LG 27UD58 27", Laptop Mag, a source that's known for its high-quality in-depth testing, has great things to say about it. In fact, it was named its "Ranked 3 out of 11" in its "11 Best MacBook and MacBook Pro Accessories You Can Buy" roundup, which is quite a feat.
When we thoroughly analyzed their review scores, we learned that all of the sources that tested both Monitors, including Rtings, preferred the Dell Alienware AW2521HF 25" over the LG 27UD58 27".
We also took a look at which sources they managed to impress the most. The Dell Alienware AW2521HF 25" was liked best by Expert Reviews, which gave it a score of 8, while the LG 27UD58 27" got its highest, 9, score from Gadget Review.
Lastly, we averaged out all of the reviews scores that we could find on these two products and compared them to other Monitors on the market. We learned that both of them performed far better than most of their competitors - the overall review average earned by Monitors being 7.3 out of 10, whereas the Dell Alienware AW2521HF 25" and LG 27UD58 27" managed averages of 7.8 and 8.0 points, respectively.
Due to the difference in their prices, however, it's important to keep in mind that a direct Dell Alienware AW2521HF 25" vs. LG 27UD58 27" comparison might not be entirely fair - some sources don't take value for money into account when assigning their scores and therefore have a tendency to rate more premium products better.
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