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Sennheiser HD 820 (2018) vs NAD VISO HP70
We couldn't find enough data on either option to be able to come to any reliable conclusions. We strongly suggest that you look at some alternatives that also cost around $350.
The Sennheiser HD 820 (2018) managed to earn a spot in roundups from two sources that are known for their trustworthy review methodology - TrustedReviews and The Verge - but fell short of making it to the top of their lists.
As for the NAD VISO HP70 - it wasn't considered to be a good enough purchase to earn a spot in any roundups conducted by sources that perform objective hands-on testing, which typically indicates that a product isn't worth its asking price.
Lastly, we tried to do a direct Sennheiser HD 820 (2018) vs. NAD VISO HP70 comparison of review ratings between these two products, but couldn't find any review scores for the NAD VISO HP70.
Compared to all other Wireless Headphones on the market, however, the Sennheiser HD 820 (2018) performed great. When averaged out, it earned a rating of 7.5 out of 10, which is much better than the 7.3 review average of Wireless Headphones in general.