I prefer Shannaro, but that could be mostly because I know who they are. :P (They already have one group, Sarosaki, coloring for them by the way.)
It's Zarosaki! XD And Zarosaki isn't coloring for them; they're just using Shannaro's forums. Zarosaki colors some of Inane's and some of Shanaro's pages; not just one or the other. - MnK
i have to go with japflap because they have equal quality [maybe better] to shannaro, and inane is also pretty good on quality... BUT, the one thing that puts japflap ahead is their consistency... i know that shannaro has their reasons for being behind, and i cant blame them at all for that, but the fact is, japflap is ahead in my book
I think all three groups come up with good pages. I remember one time having to merge an Inane page with a Shannaro page because there were elements in both pages I liked. Japflap is new but they're doing great job for such fast scanlations.
My suggestion is just researching all three versions and picking pages to use. That's what Zarosaki does. And I'm moving this to Naruto Scanlations forum.