It's actually better than the lich. You can have as many clones as you please simply waiting around, and if you die again and again, you'll use them up in the order you created them. So long as you have the time to prepare them, you can thus have unlimited clones.

Both thus have effectively unlimited lives, but the Lich is in time-out for 1d10 days whilst returning as a Clone is instantaneous.

Also, your Clones are rather safe if each placed in an individual Demiplane, with some random twig or other object tossed in so no one knows the precise contents. The lich, by contrast, needs to regularly access its phylactery to feed on souls, or else it will decay. That means it's, while surely quite secure, always at least slightly at risk of being accessed by someone else.