Tenseigan is garbage. Allow me to illustrate why.
The Tenseigan comes from having a Byakugan and using the power of the Tenseigan Altar. When Toneri fought Naruto, he looked like this.
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But before that, he had to absorb the hundreds of Byakugan into his body.
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Even with all that power, it only took Naruto in KCM to match Toneri, and eventually neg him with one punch IN BASE.
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Toneri was a punk, and no rinnegan user would ever look to base Naruto like Toneri did.
Rinnegan >>>>> Tenseigan
For that matter Byakugan >>>> Tenseigan. Kaguya, Hamura, Momoshiki, and Kinshiki all don't sport tenseigan. I wonder why?