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Asus Chromebook C523 (2018) vs Lenovo Chromebook C340-11 (2019)
Lenovo Chromebook C340-11 Intel Celeron N4000/ 4 GB/ 64 GB SSD (2019)

The Asus Chromebook C523 with Intel Pentium Quad-Core N4200 (2018) and Lenovo Chromebook C340-11 Intel Celeron N4000/ 4 GB/ 64 GB SSD (2019) make for good, if unremarkable, Chromebooks at their respective budgets.
With that said, while they both should serve reasonably well, you might want to look into other options at the $600 and $390 price points - it's likely that there are some better alternatives available.
If you want to learn more about the Asus Chromebook C523 with Intel Pentium Quad-Core N4200 (2018) and the Lenovo Chromebook C340-11 Intel Celeron N4000/ 4 GB/ 64 GB SSD (2019), however, we prepared a summary of the information that we have:
Two highly trusted sources that perform well-thought-out in-depth testing consider the Asus Chromebook C523 with Intel Pentium Quad-Core N4200 (2018) to be a great product - it earned the "Best for A Roomy Screen and a Part-Metal Build" title from PCmag and "Ranked 2 out of 5" from CNET in their respective Chromebook roundups, which is a good indication of it being a notable product.
Returning to the Lenovo Chromebook C340-11 Intel Celeron N4000/ 4 GB/ 64 GB SSD (2019), PCmag, 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 "Best for Daily Trips to and from School" in its "The Best Chromebooks for Kids in 2021" roundup, which is quite a feat.
When we thoroughly analyzed their review scores, we learned that all of the sources that tested both Chromebooks, including PCmag, preferred the Asus Chromebook C523 with Intel Pentium Quad-Core N4200 (2018) over the Lenovo Chromebook C340-11 Intel Celeron N4000/ 4 GB/ 64 GB SSD (2019).
We also took a look at which sources they managed to impress the most. The Asus Chromebook C523 with Intel Pentium Quad-Core N4200 (2018) was liked best by PCmag, which gave it a score of 8, while the Lenovo Chromebook C340-11 Intel Celeron N4000/ 4 GB/ 64 GB SSD (2019) got its highest, 9, score from Android Central.
Lastly, we averaged out all of the reviews scores that we could find on these two products and compared them to other Chromebooks on the market. We learned that both of them performed far better than most of their competitors - the overall review average earned by Chromebooks being 7.0 out of 10, whereas the Asus Chromebook C523 with Intel Pentium Quad-Core N4200 (2018) and Lenovo Chromebook C340-11 Intel Celeron N4000/ 4 GB/ 64 GB SSD (2019) managed averages of 7.5 and 7.6 points, respectively.
Due to the difference in their prices, however, it's important to keep in mind that a direct Asus Chromebook C523 with Intel Pentium Quad-Core N4200 (2018) vs. Lenovo Chromebook C340-11 Intel Celeron N4000/ 4 GB/ 64 GB SSD (2019) 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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