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Sennheiser HD 598 (2010) vs Oppo PM-3 (2015)
The Sennheiser HD 598 (2010) makes for a good, if unremarkable, Over-Ear Headphone for people with a $490 budget.
The Oppo PM-3 (2015), however, is merely mediocre at its $699 asking price, when compared to similarly priced products, and won't satisfy the needs of most people.
In either case, we suggest that you first take a look at some other options at the $490 and $770 price points before committing to one of these - it's likely that you'll be able to find some better alternatives.
If you're still interested in learning more about the Sennheiser HD 598 (2010) and Oppo PM-3 (2015), however, we wrote a summary of what we could find about them:
Android Authority, a source known for its hands-on testing and objective methodology, had good things to say about the Sennheiser HD 598 (2010). It performed great in its "Best Samsung Galaxy S10 wired and wireless headphones" roundup and earned the "Best comfort" title.
Moving on to the Oppo PM-3 (2015): it was unable to reach the very top of any roundups from sources that conduct reliable and unbiased testing. Nonetheless, it still managed to impress reviewers from a number of such sites, like Techradar, Head-fi, Headfonics, CNET, What Hi-Fi?, Expert Reviews, AVForums, and Rtings, enough for them to include them on those lists.
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 Oppo PM-3 (2015) managed averages of 7.8 and 8.2 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. Oppo PM-3 (2015) 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.