I prefer Ascensionism as well.
I posted this message after just hearing the first song and seeing the reviews. Prog metal isn't normally something that would attract my attention (I prefer prog rock and hard rock to metal), and I had no idea what I'd hear when I clicked on that first video, but the band's name and the song title and the cover image or whatever it's called for the video caught my attention. And I did find it interesting. Fascinating.
Though Ascensionism is more immediately listenable. As I found out when I was listening to Take Me Back To Eden again and didn't have it on loop and Ascensionism was next.
Everybody has different taste, though. Some of the reviews raved about their song The Summoning, the second single (one day after the first) from this album, which has more than 6 million views on YouTube, but I don't like it as well as either of the songs in the OP.
This is what Metal Hammer (part of Louder) said about The Summoning:
https://www.loudersound.com/reviews/sleep-token-take-me-back-to-eden-review
When Sleep Token released The Summoning in January, it broke the internet. They were already one of our worlds most talked-about, divisive bands, splitting listeners between those who viewed the masked, anonymous collective as a pretentious gimmick and those enthralled by their blend of ambience, thunderous tech-metal and mournful pop melodies all elevated by their ritualistic live shows and singer Vessels soulful, cursive vocals.
The Summoning, the second single from third album Take Me Back To Eden, stunned fans and earned them a legion of new ones. Taking every idiosyncrasy of the Sleep Token experience to the next level, it veered between a cathedral-sized hymnal chorus and the heaviest breakdown and vocals theyd ever recorded and with it, the kind of baby-making, jazz fusion volte-face youd expect from funk/soul producer Thundercat. It blew raspberries at anyone who had accused their ambient/heavy switch-ups of becoming formulaic. Since then, its been streamed 25 million times on Spotify, topping online charts and trending on TikTok. Suddenly, the band many initially dismissed as a spurious oddity had become one of the biggest deals in modern metal.