Yea you guess right. Toneri is stronger and better than any Mode of Sasuke.
People keep saying he was solo'd by just a single punch. This is so false. It wasn't just a mere punch.
The shockwave alone created a huge crater similar to the size of a Bijuu Dama. And the impact of this punch was even stronger than Gai's Night Moth which almost killed Madara.
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If Toneri where to face Sasuke, it won't end quickly as most people assume. Toneri's Tenseigan has been stated to rival the Rinnegan. It also as the ability to form it's own Truth seeking ball and Chakra cloak.
Naruto had to engage Toneri on Taijutsu before he could impede him. Mind you, Taijutsu is more preferable when facing characters like Toneri or Madara considering they can counter most Ninjutsus.
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Sasuke isn't a Taijutsu type of Ninja but more of a Rinnegan/Susanoo/Genjutsu type. Thus him losing against Toneri is inevitable!