I usually like to see both, as I never watch intro videos while I'm sure that others do.

A/B testing is not necessarily a binary thing, you could use it for prioritization too. You could still display the video on the landing page (= default), with a small, tiny, barely visible button/text that directs the curious user to the page with text and illustrations.

Video and the app look fantastic though, best of luck. I almost never watch a video too, but I watched it this time and liked it a lot.

"me too" for the text + illustration option. I have work, kids etc etc so I want to learn what it is at my pace, not at a pre-determined unknown "I wonder how long this video is and what level its pitched at" kind of pace.