Amal has a special quality to her, and I think it comes from her personality. She's confident, and in my opinion, that confidence translates into that easy going quality of her voice. Listening to her is like listening to a friend.
Amal has lots of great videos. Her ASMR efforts feel so natural. She doesn't have to work to give tingles to the viewer, she naturally possesses a voice like honey and smooth gesturing. So what makes her nail salon video so special?
I like videos that have variety in triggers. I like different sounds and movements because (for me) too much repetition dulls the tingly sensation, which is probably why I gravitate to role plays so often instead of specialty videos (like just tapping, or just scratching). Amal's nail salon video has a lot of triggers, presented in a subtle way: there's water, tapping, counting, whispering, presentation, and personal attention, spread out throughout the video.
There are plenty of videos out there that posses the traits that Amal's nail video does---but for some reason Amal's nail video knocks me out. Every time. Halfway through. I have watched it so many times, and it never fails to deliver. For that, it gets my #3 spot.