The easiest (and best) way to compare the fonts was to stack 'em together:
(A) is nice in isolation, but clearly not as fluid and graceful as (B). It may be possible to salvage (A) by adjusting the overall tracking (spacing) between all the letters (but that would require a lot of work, and I don't know if there is any extra room in the individual tiles.) Kerning between certain letter combos is also an issue, but tracking would probably solve most of (A)'s shortcoming.
(B) is truly elegant and charming. It doesn't seem to offer as much contrast with the background as (A) or (B). Odd, since (A) and (B) are not much different. (B) is the sans serif version of (A), with pussy-footed dots over the "i".
(C) is [bold] and easy to read even when you are sleepy and about to enter the land of Nod. I think it is easy to read, but it does seem a bit heavy-handed compared to (B), no? (B) sharply contrasts with the background, which definitely improves its readability.