I've used both services.
As a beginner I appreciated the way that TextFugu is written and liked the grammar explanations more than my textbooks, I also liked the idea of having the author available for help. Unfortunately it's still very incomplete and Koichi is slow to add new lessons. I finished all the material there months ago and season 4 still hasn't been continued since then. I feel that my studies are now always going to be more advanced than what he has available, so I'd hesitate in recommending paying for it until there's a lot more content there.
Using Skritter with a tablet is pretty fun and a nice way to make sure your stroke order is correct, but I don't like it as an SRS. It's never clear to me when I should end a session and there's so much repetition that I find myself burning out on it. I'm not exactly sure why but I actually find my retention is considerably better using a pencil and paper with Anki.
As a beginner I appreciated the way that TextFugu is written and liked the grammar explanations more than my textbooks, I also liked the idea of having the author available for help. Unfortunately it's still very incomplete and Koichi is slow to add new lessons. I finished all the material there months ago and season 4 still hasn't been continued since then. I feel that my studies are now always going to be more advanced than what he has available, so I'd hesitate in recommending paying for it until there's a lot more content there.
Using Skritter with a tablet is pretty fun and a nice way to make sure your stroke order is correct, but I don't like it as an SRS. It's never clear to me when I should end a session and there's so much repetition that I find myself burning out on it. I'm not exactly sure why but I actually find my retention is considerably better using a pencil and paper with Anki.