I'd prefer not to be more specific, actually; at least on most points. Complaining about popular new things in threads about them is a trend I find irritating, and using a thread about how someone finds something cool to give reasoning as to why it's distasteful is completely off-topic and kind of rude, anyhow.

However, I will note that I listed two competitors, not one, and while I think both have more merit, I only think the best is worth using out of all three. I'll point out that it's not Guix, and that it's older than Nix, but I don't think advertising alternatives is a particularly nice thing to do in a thread about any given piece of free software.