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Sennheiser HD 598 (2010) vs Bluedio T4 (2017)
While the Sennheiser HD 598 (2010) makes for a fairly good Over-Ear Headphone for people with a $340 budget, we weren't able to find enough data on the Bluedio T4 (2017) to come to any reliable conclusions.
In either case, we suggest that you look at some other options before committing to one of these.
If you'd nonetheless like to learn more about the Sennheiser HD 598 (2010) and Bluedio T4 (2017), however, we wrote a summary of what we know about them:
Android Authority, a review site with a history of doing objective hands-on testing, has great things to say about the Sennheiser HD 598 (2010). In fact, it's "Best comfort" in its "Best Samsung Galaxy S10 wired and wireless headphones" roundup, which points toward it being a good Over-Ear Headphone.
Taking a look at the Bluedio T4 (2017), it got featured in roundups from two reliable sources that conduct their own testing - Head-fi and Rtings - but it fell short of earning a top spot in either.
We analyzed all of the review data that we could find on these two Over-Ear Headphones. First, we examined sources that tested and scored both of these products - Rtings favored the Bluedio T4 (2017) over the Sennheiser HD 598 (2010), whereas reviewers at Head-fi haven't shown a preference for either.
Then we took a look at which sources liked them the most - we found that the Sennheiser HD 598 (2010) was best received by Head-fi - it gave it a score of 9.5, whereas the Bluedio T4 (2017) got its highest score of 9.5 from reviewers at Head-fi.
Lastly, we averaged out all of the reviews scores that we could find on these two products and compared them to other Over-Ear Headphones on the market. We learned that both of them performed far better than most of their competitors - the overall review average earned by Over-Ear Headphones being 7.5 out of 10, whereas the Sennheiser HD 598 (2010) and Bluedio T4 (2017) 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 Sennheiser HD 598 (2010) vs. Bluedio T4 (2017) 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.