Those reviews don't look very inspiring, not gonna lie. Also, their About page says their service is run from Costa Rica?
Ultimately I don't think these "privacy-first" domain registrars are a great choice, which is a rare thing to say about an internet service.
But you're dealing with private property here and being ICANN-accredited (which Njalla isn't) is kind of important if you're gonna do something serious with your domain. You want those protections that excessive privacy won't permit having.